PLC Communication Modules

Showing 169 - 192 of 234 products

$4,599.65

Only 3 units left

Buy the Siemens 6DD1600-0AK - a genuine Siemens industrial automation component engineered for reliable performance in demanding manufacturing and process control environments. The Siemens 6DD1600-0AK is a direct drop-in replacement for existing installations and ships ready for integration.

Siemens 6DD1661-0AB1 Siemens

$5,288.82

Only 9 units left

Product
Article Number (Market Facing Number)	6DD16610AB1 \| 6DD16610AB1
Product Description	* SPARE PART* SIMADYN D COMMUNICATION MODULE CSH11 SLAVE INTERFACE FOR BUS SYSTEM SINEC H1
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643269314
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)	1.543 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1801-1DA2 Siemens

$10,307.25

Only 2 units left

Product
Article Number (Market Facing Number)	6DD18011DA2
Product Description	SIMADYN D STRUC PACKAGE G/L 4.2 SINGLE LICENSE WITH DOCUMENTS ON CD GERMAN/ENGLISH GRAPH EDITOR F.SCO. UNIX ODT3.0 CD-ROM/DISK, 3.5 INCH, GERMAN/ENGLISH
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	Not available
LKZ_FDB/ CatalogID	ST9.DA99A
Product Group	Not available
Group Code	R111
Country of origin	Not available
SCIP number	Not available
Delivery information
Net Weight (lb)	2.187 lb
Package size unit of measure	Not available
Packaging Quantity	1

Siemens 6DD1661-0AD0 Siemens

$2,908.29

Only 4 units left

Product
Article Number (Market Facing Number)	6DD16610AD0 \| 6DD16610AD0
Product Description	*Spare part* SIMATIC TDC Communication module CP 50M0 with 8 MB buffer module up to 2 MPI interface, up to 2 PROFIBUS DP Interfaces Use as DP master with parameterization SW "COM-PROFIBUS" (compatible operating system versions to be observed)
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	4019169134811
UPC	662643297089
Commodity Code	85176200
LKZ_FDB/ CatalogID	ST9.DA99T
Product Group	4476
Group Code	R111
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	1.155 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1681-0EB2 Siemens

$981.06

Only 6 units left

Buy the Siemens 6DD1681-0EB2 Communication Module - an industrial network interface providing controller-to-device connectivity. Supports standard industrial protocols for seamless automation integration. The Siemens 6DD1681-0EB2 is a direct replacement for existing communication installations.

Siemens 6DD1660-0BG0 Siemens

$61,013.12

Only 1 unit left

Product
Article Number (Market Facing Number)	6DD16600BG0 \| 6DD16600BG0
Product Description	SIMATIC TDC communications module CP52IO interface module for global data memory (GDM) with 4 interfaces
Product family	GlobalDataMemory
Product Lifecycle (PLM)	PM400:Announcement of product phase-out
Additional Product Information
EAN	4019169134798
UPC	040892692655
Commodity Code	85176200
LKZ_FDB/ CatalogID	ST.DA99
Product Group	2310
Group Code	R132
Country of origin	Germany
SCIP number	8d3be353-821b-450b-a98f-0f7480269e1a
Delivery information
Net Weight (lb)	1.195 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1842-0AA1 Siemens

$2,552.57

Only 8 units left

Buy the Siemens 6DD1842-0AA1 - a genuine Siemens industrial automation component engineered for reliable performance in demanding manufacturing and process control environments. The Siemens 6DD1842-0AA1 is a direct drop-in replacement for existing installations and ships ready for integration.

Siemens 6DD1660-0AC0 Siemens

$2,309.50

Only 1 unit left

Product
Article Number (Market Facing Number)	6DD16600AC0
Product Description	SIMADYN D DIGITAL CONTR.SYSTEM RACK INTERFACE MODULE CS2 DIFFERENTIAL LINE DRIVER
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	Not available
LKZ_FDB/ CatalogID	DA99E
Product Group	Not available
Group Code	P121
Country of origin	Not available
SCIP number	Not available
Delivery information
Net Weight (lb)	Not available
Package size unit of measure	Not available
Packaging Quantity	Not available

Siemens 6DD1607-0GA0 Siemens

$0.00

Sold Out

Product
Article Number (Market Facing Number)	6DD16070GA0 \| 6DD16070GA0
Product Description	* spare part * SIMATIC S7-400, FM458-1DP know-how-protect
Product family	Not available
Product Lifecycle (PLM)	PM410:Product cancellation
Additional Product Information
EAN	Not available
UPC	662643399240
Commodity Code	85389091
LKZ_FDB/ CatalogID	ST74
Product Group	4100
Group Code	R132
Country of origin	Germany
SCIP number	3e73d615-f371-497d-9052-9eb9b784bb9f
Delivery information
Net Weight (lb)	0.055 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1611-0AF0 Siemens

$4,900.75

Only 6 units left

Product
Article Number (Market Facing Number)	6DD16110AF0 \| 6DD16110AF0
Product Description	* SPARE PART* SIMADYN D MAILBOX MM3 L- AND C-BUS , EACH 64KB RAM RADIO CLOCK SYSTEM ERROR SIGNAL OUTPUT
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643267310
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)	1.314 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1610-0AG0 Siemens

$2,923.78

Only 4 units left

Product
Article Number (Market Facing Number)	6DD16100AG0
Product Description	SIMADYN D MEMORY SUBMODULE MS4 512 KBYTES EPROM, 1 WAIT STATE
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	ST9.DA99T
Product Group	4315
Group Code	R111
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	0.220 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1681-0DD1 Siemens

$1,087.50

Only 5 units left

Product
Article Number (Market Facing Number)	6DD16810DD1 \| 6DD16810DD1
Product Description	* SPARE PART* SIMADYN D INTERFACE MODULE SB30 2X8-CHANNELS REDUNDANT DIGITAL OUTPUT
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643035025
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)	0.829 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1683-0BC0 Siemens

$7,467.81

Only 4 units left

Buy the Siemens 6DD1683-0BC0 Power Supply - an industrial-grade power supply module providing regulated DC output for Siemens automation systems. Features overcurrent protection, high efficiency, wide input voltage range, and DIN-rail mounting. The Siemens 6DD1683-0BC0 is a direct replacement for existing installations.

Siemens 6DD1681-0EC0 Siemens

$2,464.50

Only 1 unit left

Product
Article Number (Market Facing Number)	6DD16810EC0
Product Description	SIMADYN D INTERFACE MODULE SE42 DISTRIBUTOR PRK (PARALLEL SUBFRAME CONNECTION)
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	ST9.DA99T
Product Group	4315
Group Code	R111
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	0.992 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1684-0GF0 Siemens

$437.28

Only 3 units left

Buy the Siemens 6DD1684-0GF0 Cable/Accessory - a factory-specified component for Siemens industrial automation systems providing reliable signal, power, or communication connections. The Siemens 6DD1684-0GF0 is a direct replacement for existing installations.

Siemens 6DD2920-0AD0 Siemens

$8,019.20

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 6DD1660-0AJ0 Siemens

$1,428.03

Only 4 units left

Buy the Siemens 6DD1660-0AJ0 - a genuine Siemens industrial automation component engineered for reliable performance in demanding manufacturing and process control environments. The Siemens 6DD1660-0AJ0 is a direct drop-in replacement for existing installations and ships ready for integration.

Siemens 6DD1671-0AB2 Siemens

$649.26

Only 4 units left

Product
Article Number (Market Facing Number)	6DD16710AB2
Product Description	SIMADYN D DIGITAL CONTR.SYSTEM POCKET SERVICE UNIT US1 WITH BATTERY
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	Not available
LKZ_FDB/ CatalogID	DA99
Product Group	Not available
Group Code	P122
Country of origin	Not available
SCIP number	Not available
Delivery information
Net Weight (lb)	Not available
Package size unit of measure	Not available
Packaging Quantity	Not available

Siemens 6DD2920-0AA0 Siemens

$18,941.85

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 6DD1645-0AC0 Siemens

$2,942.23

Only 2 units left

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

Siemens 6DD1660-0BJ0 Siemens

$43,016.27

Only 2 units left

Product
Article Number (Market Facing Number)	6DD16600BJ0 \| 6DD16600BJ0
Product Description	SIMATIC TDC communications module CP53M0 rack coupling TDC <--> SIMADYN
Product family	CP53M0 coupling module
Product Lifecycle (PLM)	PM400:Announcement of product phase-out
Additional Product Information
EAN	4019169189613
UPC	662643524260
Commodity Code	85176200
LKZ_FDB/ CatalogID	ST.DA99
Product Group	2310
Group Code	R132
Country of origin	Germany
SCIP number	ed6325b8-e9cd-4a68-a4c8-6c9590b50e84
Delivery information
Net Weight (lb)	0.002 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD2920-0A00 Siemens

$1,573.25

Only 3 units left

Buy the Siemens 6DD2920-0A00 - a genuine Siemens industrial automation component engineered for reliable performance in demanding manufacturing and process control environments. The Siemens 6DD2920-0A00 is a direct drop-in replacement for existing installations and ships ready for integration.

Siemens 6DD1682-0CH3 Siemens

$23,218.74

Only 7 units left

Product
Article Number (Market Facing Number)	6DD16820CH3 \| 6DD16820CH3
Product Description	SIMATIC TDC, Rack UR6021, 21 slots, VMEBUS, 8 P0 slots, replaceable fans, suitable for GDM 5-tier plug-in connector
Product family	UR6021 rack
Product Lifecycle (PLM)	PM400:Announcement of product phase-out
Additional Product Information
EAN	4025515739821
UPC	804766193279
Commodity Code	85389091
LKZ_FDB/ CatalogID	ST.DA99
Product Group	2310
Group Code	R132
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	45.195 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1681-0GK0 Siemens

$827.72

In stock, 11 units

Product
Article Number (Market Facing Number)	6DD16810GK0 \| 6DD16810GK0
Product Description	SIMATIC TDC, Converter SU13 50 terminals (1: 1 connection)
Product family	SU13 interface module
Product Lifecycle (PLM)	PM400:Announcement of product phase-out
Additional Product Information
EAN	4025515739814
UPC	662643035063
Commodity Code	85389091
LKZ_FDB/ CatalogID	ST.DA99
Product Group	2310
Group Code	R132
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	0.811 lb
Package size unit of measure	Inch
Packaging Quantity	1

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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.