PLC Communication Modules

Showing 49 - 72 of 234 products

$12,186.23

Only 6 units left

Product
Article Number (Market Facing Number)	6DD16830BB0
Product Description	* SPARE PART* SIMADYN D POWER SUPPLY UNIT SP7 5V/7A, 15V, 230V 1PH
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	Not available
Commodity Code	85044090
LKZ_FDB/ CatalogID	ST9.DA99T
Product Group	4230
Group Code	R111
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	2.205 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1670-0AF0 Siemens

$62,803.35

Only 3 units left

Product
Article Number (Market Facing Number)	6DD16700AF0 \| 6DD16700AF0
Product Description	* SPARE PART* SIMADYN D OPERATOR PANEL 0P1
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643399288
Commodity Code	85389091
LKZ_FDB/ CatalogID	ST9.DA99T
Product Group	4230
Group Code	R111
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	7.132 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1607-0EA0 Siemens

$2,385.11

Only 7 units left

Product
Article Number (Market Facing Number)	6DD16070EA0 \| 6DD16070EA0
Product Description	*Spare part* SIMATIC S7-400, Communication expansion EXM 448 for FM 458 Use as DP master with parameterization SW "COM-PROFIBUS" (compatible operating system versions to be observed)
Product family	Not available
Product Lifecycle (PLM)	PM410:Product cancellation
Additional Product Information
EAN	4019169120555
UPC	Not available
Commodity Code	85389091
LKZ_FDB/ CatalogID	ST9.DA99T
Product Group	4100
Group Code	R132
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	2.227 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1606-0AD1 Siemens

$4,019.64

In stock, 13 units

Product
Article Number (Market Facing Number)	6DD16060AD1 \| 6DD16060AD1
Product Description	*Spare part* SIMADYN D Technology module T400 for 6SE70/71 and SRT400 32 Bit/32MHz, 8BE, 2BA, 4BE/BA 5AE, 2 AO, 2 pulse encoder inputs 2SER.INTERFACE+1SSI-encoder or 1SER.INTERFACE+2SSI-encoder Configurable with D7-SYS 1MB Flash, 2MB RAM, 32KB EEPROM
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643297614
Commodity Code	85389091
LKZ_FDB/ CatalogID	ST9.DA99T
Product Group	4230
Group Code	R132
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	1.032 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1671-0AB0 Siemens

$1,124.59

Only 1 unit left

PLC Direct is not an authorized distributor. We offer a broad range of in-stock products with minimal lead time.

Siemens 6DD1684-0GE0 Siemens

$0.00

Sold Out

Product
Article Number (Market Facing Number)	6DD16840GE0 \| 6DD16840GE0
Product Description	* spare part * SIMATIC S7-400, round cable SC64 9/10-pole for connection from an interface module SBXX or SU12 to the digital inputs of the FM458; length 2 m
Product family	Not available
Product Lifecycle (PLM)	PM410:Product cancellation
Additional Product Information
EAN	Not available
UPC	662643035254
Commodity Code	85444290
LKZ_FDB/ CatalogID	ST.DA99
Product Group	4100
Group Code	R132
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	0.304 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1683-0CC5 Siemens

$12,744.34

Only 3 units left

Product
Article Number (Market Facing Number)	6DD16830CC5 \| 6DD16830CC5
Product Description	* SPARE PART* SIMADYN D POWER SUPPLY UNIT SP22.5 5V/25A, 15V, 115/230 V AC INPUT FAN
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643035179
Commodity Code	85044090
LKZ_FDB/ CatalogID	ST9.DA99T
Product Group	4230
Group Code	R111
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	11.023 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1600-0AF0 Siemens

$1,899.50

Only 7 units left

Product
Article Number (Market Facing Number)	6DD16000AF0 \| 6DD16000AF0
Product Description	* SPARE PART* SIMADYN D PROCESS MODULE PM16 GENERAL APPLICATION 16BIT16MHZ L- AND C-BUS , 16BI AL, 16BO
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643475685
Commodity Code	85371091
LKZ_FDB/ CatalogID	ST9.DA97T
Product Group	4230
Group Code	R111
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	1.470 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1607-0EA2 Siemens

$6,086.89

Only 9 units left

Product
Article Number (Market Facing Number)	6DD16070EA2 \| 6DD16070EA2
Product Description	* spare part * SIMATIC S7-400, EXM 448-2 communication extension with 2 SIMOLINK interfaces
Product family	Not available
Product Lifecycle (PLM)	PM410:Product cancellation
Additional Product Information
EAN	4019169127981
UPC	662643297942
Commodity Code	85389091
LKZ_FDB/ CatalogID	ST.DA99
Product Group	4100
Group Code	R132
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	0.002 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1611-0AD0 Siemens

$2,196.75

Only 9 units left

Product
Article Number (Market Facing Number)	6DD16110AD0 \| 6DD16110AD0
Product Description	* SPARE PART* SIMADYN D MAILBOX MM11 L- AND C-BUS , EACH 64KB RAM
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643034837
Commodity Code	85389091
LKZ_FDB/ CatalogID	ST9.DA99T
Product Group	4230
Group Code	R111
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	1.082 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1610-0AH5 Siemens

$0.00

Sold Out

Buy the Siemens 6DD1610-0AH5 - a genuine Siemens industrial automation component engineered for reliable performance in demanding manufacturing and process control environments. The Siemens 6DD1610-0AH5 is a direct drop-in replacement for existing installations and ships ready for integration.

Siemens 6DD1688-1AA0 Siemens

$937.49

Only 4 units left

Product
Article Number (Market Facing Number)	6DD16881AA0 \| 6DD16881AA0
Product Description	* SPARE PART* SIMADYN D INTERFACE SUBMODULE SS1 20MA (TTY)
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643399370
Commodity Code	85423990
LKZ_FDB/ CatalogID	ST9.DA99T
Product Group	4230
Group Code	R111
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	0.053 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1600-0AJ0 Siemens

$7,391.89

Only 8 units left

Product
Article Number (Market Facing Number)	6DD16000AJ0 \| 6DD16000AJ0
Product Description	* SPARE PART* SIMADYN D PM5, 32-BIT CPU MODULE WITH BINARY, ABSOLUTE AND INCREMENT. INPUTS, L AND C BUS
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643034660
Commodity Code	85389091
LKZ_FDB/ CatalogID	ST9.DA97T
Product Group	4230
Group Code	R111
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	1.146 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1688-1AB0 Siemens

$720.71

Only 3 units left

Buy the Siemens 6DD1688-1AB0 - a genuine Siemens industrial automation component engineered for reliable performance in demanding manufacturing and process control environments. The Siemens 6DD1688-1AB0 is a direct drop-in replacement for existing installations and ships ready for integration.

Siemens 6DD1660-0BC0 Siemens

$0.00

Sold Out

Product
Article Number (Market Facing Number)	6DD16600BC0 \| 6DD16600BC0
Product Description	* SPARE PART* SIMADYN D COMMUNICATION MODULE CS14 FRAME COUPLING VIA FIBRE OPTIC CABLE, 8 TRANSMITTERS/RECEIVERS
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643269369
Commodity Code	85176200
LKZ_FDB/ CatalogID	ST9.DA99T
Product Group	4230
Group Code	R111
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	3.400 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1640-0AC0 Siemens

$1,341.25

Only 9 units left

Product
Article Number (Market Facing Number)	6DD16400AC0 \| 6DD16400AC0
Product Description	* SPARE PART* SIMADYN D, INPUT OUTPUT MODULE EM11 16BIT , 8BO, 4AI, 4AI INT., 2AO PULSE SENSING
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643034851
Commodity Code	85389091
LKZ_FDB/ CatalogID	ST9.DA99T
Product Group	4230
Group Code	R111
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	1.243 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD2920-0AC0 Siemens

$2,799.95

Only 5 units left

PLC Direct is not an authorized distributor. We offer a broad range of in-stock products with minimal lead time.

Siemens 6DD1660-0AK1 Siemens

$1,968.50

Only 3 units left

PLC Direct is not an authorized distributor. We offer a broad range of in-stock products with minimal lead time.

Siemens 6DD1681-0AF2 Siemens

$922.62

Only 1 unit left

PLC Direct is not an authorized distributor. We offer a broad range of in-stock products with minimal lead time.

Siemens 6DD1683-0CH0 Siemens

$5,759.40

Only 4 units left

Product
Article Number (Market Facing Number)	6DD16830CH0
Product Description	*Spare part* SIMATIC TDC Power supply PS5213, with fan 95 V-255 V input voltage
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	Not available
Commodity Code	85044090
LKZ_FDB/ CatalogID	ST9.DA99T
Product Group	4476
Group Code	R111
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	13.814 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1648-0AB0 Siemens

$1,738.55

Only 2 units left

Product
Article Number (Market Facing Number)	6DD16480AB0
Product Description	SIMADYN D ES1 SPECIAL BOARD VOLTAGE MONITORING RESET, BUSSTATUS
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	Not available
Commodity Code	85049099
LKZ_FDB/ CatalogID	ST9.DA99T
Product Group	Not available
Group Code	R111
Country of origin	Not available
SCIP number	Not available
Delivery information
Net Weight (lb)	1.389 lb
Package size unit of measure	Not available
Packaging Quantity	1

Siemens 6DD1843-0AA0 Siemens

$6,999.99

Only 3 units left

Buy the Siemens 6DD1843-0AA0 - a genuine Siemens industrial automation component engineered for reliable performance in demanding manufacturing and process control environments. The Siemens 6DD1843-0AA0 is a direct drop-in replacement for existing installations and ships ready for integration.

Siemens 6DD1683-0CD0 Siemens

$6,634.33

Only 3 units left

Product
Article Number (Market Facing Number)	6DD16830CD0
Product Description	* SPARE PART* SIMADYN D POWER SUPPLY UNIT SP23 5V/25A, 15V, 24V DC INPUT
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	Not available
Commodity Code	85044090
LKZ_FDB/ CatalogID	ST9.DA99T
Product Group	4230
Group Code	R111
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	10.274 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD7090-0AA10 Siemens

$3,298.40

Only 3 units left

Product
Article Number (Market Facing Number)	6DD70900AA10
Product Description	CONTROL UNIT FOR PLUSCONTROL 4 ANALOG INPUTS 12 DIGITAL INPUTS 4 ANALOG OUTPUTS 8 DIGITAL OUTPUTS 3 LAN PLUGS 1 OPTICAL INTERFACE DCF77 INPUT OPTICAL
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	Not available
Commodity Code	85389091
LKZ_FDB/ CatalogID	ENERGY-PTDH1T1
Product Group	9101
Group Code	U748
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	2.205 lb
Package size unit of measure	Not available
Packaging Quantity	1

Previous Page 3 / 10Next

PLC communication modules are plug-in hardware cards that extend a programmable logic controller's network connectivity, enabling data exchange with field devices, other controllers, SCADA systems, and enterprise networks via protocols such as PROFIBUS, PROFINET, EtherNet/IP, CC-Link, and Modbus. PLC Direct supplies PLC communication modules as an independent supplier, carrying surplus sealed, refurbished, and used hardware for maintenance and replacement in installed PLC systems.

Where Are PLC Communication Modules Used in Industrial Environments?

PLC communication modules are used wherever a controller must exchange data with field devices, distributed I/O, drives, HMIs, or higher-level systems over an industrial network protocol. These modules are installed in the PLC rack or backplane and handle all protocol-level communication independently of the CPU's primary scan cycle.

Facilities and operations that depend on PLC communication modules include:

Discrete manufacturing plants connecting PLC controllers to distributed I/O stations, servo drives, and robot interfaces over PROFIBUS or PROFINET.
Automotive assembly operations requiring high-speed, deterministic network communication across multi-PLC production line architectures.
Process industry facilities integrating PLCs with DCS systems, field instruments, and SCADA platforms over Modbus TCP or EtherNet/IP.
Water and wastewater treatment plants using communication modules to connect remote pump station controllers to centralized SCADA networks.
Food and beverage processing facilities coordinating PLC-to-PLC data exchange across filling, packaging, and conveyor control systems.

A failed or discontinued PLC communication module can isolate an entire controller from its network, making replacement availability a direct operational priority for maintenance teams.

Which Brands of PLC Communication Modules Does PLC Direct Stock?

PLC Direct stocks PLC communication modules across the major controller platforms and industrial network protocols deployed in installed automation systems worldwide.

Siemens SIMATIC CP343 and CP443 series: Communications processors for SIMATIC S7-300 (CP343-1) and S7-400 (CP443-1) controllers, covering Industrial Ethernet via TCP/IP, PROFINET IO, and S7 communication protocols.
Mitsubishi Electric MELSEC Q Series network modules: QJ71E71-100 Ethernet interface modules and QJ61BT11N CC-Link master/local modules for MELSEC Q Series systems, enabling Ethernet and CC-Link network connectivity within installed Q Series architectures.
Omron CJ Series communication modules: CJ1W-EIP21 EtherNet/IP communication modules for CJ Series PLC systems, supporting EtherNet/IP tag data link and message communication with compatible field devices and controllers.
ABB S500 communication interface modules: CI541-DP PROFIBUS and CI592-CS31 interface modules for AC500-based systems, extending distributed I/O connectivity across PROFIBUS DP and CS31 fieldbus networks.

PLC Direct carries PLC communication modules as surplus sealed, refurbished, and used hardware, giving maintenance teams options across condition grades and budget requirements.

What Should You Know Before Ordering PLC Communication Modules?

Hardware condition options: PLC Direct supplies PLC communication modules in surplus sealed, refurbished, and used conditions. Surplus sealed units are factory-sealed stock that has not been previously installed; refurbished modules have been inspected and tested to confirm operational functionality; used hardware is sourced from decommissioned systems and suits facilities managing lifecycle replacements under budget constraints.

Compatibility and part identification: PLC communication modules are platform-specific and must be matched to the correct controller series, rack slot type, and firmware environment. A CP343-1 for the S7-300, for example, is not compatible with an S7-400 rack. Confirm the full part number, controller series, and target protocol from the installed system's hardware documentation or network configuration before ordering.

Warranty: All PLC communication module hardware purchased from PLC Direct carries a standard 1-year PLC Direct warranty covering defects and functionality, applicable to surplus sealed, refurbished, and used products.

PLC Direct supplies PLC communication module hardware for replacement and maintenance purposes and does not provide system design, programming, or integration services.

Frequently Asked Questions

A PLC communication module handles network protocol processing independently of the controller CPU, managing data exchange with field devices, distributed I/O, drives, and higher-level systems over protocols such as PROFIBUS, PROFINET, EtherNet/IP, and CC-Link. By offloading network communication to a dedicated module, the CPU scan cycle is not interrupted by network traffic, maintaining deterministic control performance.

In most cases a like-for-like replacement of the same part number will restore network communication without changes to the controller program, as the module's protocol configuration is typically stored in the CPU project rather than in the module itself. However, some platforms require the module to be initialized or assigned a network address during commissioning, so the system's network configuration documentation should be reviewed before installation.

PROFIBUS is a serial fieldbus protocol operating over RS-485 physical layer at data rates up to 12 Mbps, widely installed in legacy automation systems from the 1990s onward. PROFINET runs over standard Industrial Ethernet infrastructure at 100 Mbps or higher and supports real-time and isochronous communication modes; it is the current standard for Siemens-based networks and increasingly predominant across other platforms. Modules for each protocol are not interchangeable even within the same controller family.

The most reliable method is to read the part number directly from the installed module's label and cross-reference it against the controller's hardware manual to confirm the rack slot type, protocol, and firmware compatibility. For Siemens S7-300 and S7-400 systems, the CP part number encodes both the protocol and the controller family it is designed for.

Many communication modules for legacy platforms including the Siemens SIMATIC S7-300 CP343 series and Mitsubishi MELSEC Q Series network modules remain available through independent suppliers even after manufacturer discontinuation, as installed base demand continues well beyond the end of production. Contact PLC Direct with the part number to check current availability.