PLC Communication Modules

Showing 73 - 96 of 234 products

$2,298.12

Only 1 unit left

Product
Article Number (Market Facing Number)	6DD16630AB0
Product Description	* SPARE PART* SIMADYN D EXPANSION MODULE ITSL FOR PM4, PM5, PM6, SIMOLINK MASTER INTERFACE
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	4230
Group Code	R111
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	1.036 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD3460-0AB0 Siemens

$715.50

Only 3 units left

Buy the Siemens 6DD3460-0AB0 - a genuine Siemens industrial automation component engineered for reliable performance in demanding manufacturing and process control environments. The Siemens 6DD3460-0AB0 is a direct drop-in replacement for existing installations and ships ready for integration.

Siemens 6DD2920-0AR2 Siemens

$5,458.48

Only 4 units left

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

Siemens 6DD1681-0AE1 Siemens

$562.50

Only 1 unit left

Product
Article Number (Market Facing Number)	6DD16810AE1
Product Description	SIMADYN D INTERFACE MODULE SE4.1 8BI/BO,24V,LED
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)	0.324 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1606-1AC0 Siemens

$2,811.36

Only 8 units left

Product
Article Number (Market Facing Number)	6DD16061AC0 \| 6DD16061AC0
Product Description	* SPARE PART* SIMADYN D, PROCESSOR MODULE PT20 TECHNOLOGY 16 BIT, 20 MHZ L-BUS, 16 BI AL., 8 BI , 16 BO 7 AE , 4AO, 2 SENSING INPUTS
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643399233
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)	1.340 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1610-0AD0 Siemens

$644.10

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 6DD1660-0BA0 Siemens

$6,549.20

Only 6 units left

Product
Article Number (Market Facing Number)	6DD16600BA0 \| 6DD16600BA0
Product Description	* SPARE PART* SIMADYN D COMMUNICATION MODULE CS12 FRAME COUPLING VIA LWL 1 RECIEVER/TRANSMITTER
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643269376
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)	1.012 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1606-2AC0 Siemens

$5,659.49

Only 6 units left

Product
Article Number (Market Facing Number)	6DD16062AC0 \| 6DD16062AC0
Product Description	* SPARE PART* SIMADYN D, PROCESSOR MODULE PT20G TECHNOLOGY 16 BIT , 20 MHZ WITH 1 SITOR INTERFACE
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643355109
Commodity Code	85371091
LKZ_FDB/ CatalogID	ST9.DA99T
Product Group	4230
Group Code	R111
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	1.872 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1606-4AB0 Siemens

$1,582.14

Only 5 units left

Product
Article Number (Market Facing Number)	6DD16064AB0 \| 6DD16064AB0
Product Description	* SPARE PART* SIMADYN D I/O SUBMODULE IT42 FOR PM4/PM5/PM6 16 BI, 16 BO, 4 AI (A/D), 4 AI (V/F), 4 AO
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643265187
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)	1.316 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1681-0AG1 Siemens

$2,320.00

Only 5 units left

Product
Article Number (Market Facing Number)	6DD16810AG1 \| 6DD16810AG1
Product Description	SIMADYN D INTERFACE MODULE SE6.1 8BO, 24V/230V, LED, GALAVANIC ISOLATION
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)	0.705 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD16880AE2-SS52 Siemens

$1,129.84

Only 4 units left

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

Siemens 6DD1660-0BB0 Siemens

$6,062.67

Only 2 units left

Product
Article Number (Market Facing Number)	6DD16600BB0 \| 6DD16600BB0
Product Description	* SPARE PART* SIMADYN D COMMUNICATION MODULE CS13 FRAME COUPLING VIA FIBRE OPTIC CABLE , 4 TRANSMITTER/RECEIVERS
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643399271
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)	2.028 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1600-0AD2 Siemens

$5,996.40

Only 1 unit left

Product
Article Number (Market Facing Number)	6DD16000AD2
Product Description	Not available
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 6DD1641-0AB0 Siemens

$2,309.50

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 6DD1670-0AG0 Siemens

$3,506.64

Only 4 units left

Buy the Siemens 6DD1670-0AG0 - a genuine Siemens industrial automation component engineered for reliable performance in demanding manufacturing and process control environments. The Siemens 6DD1670-0AG0 is a direct drop-in replacement for existing installations and ships ready for integration.

Siemens 6DD2920-0AR5 Siemens

$20,270.25

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 6DD1600-0BB0 Siemens

$29,338.39

Only 9 units left

Product
Article Number (Market Facing Number)	6DD16000BB0 \| 6DD16000BB0
Product Description	SIMATIC TDC, CPU555 64-bit processor module with PROFINET IRT
Product family	CPU555 processor module
Product Lifecycle (PLM)	PM400:Announcement of product phase-out
Additional Product Information
EAN	4019169192385
UPC	804766213663
Commodity Code	85371091
LKZ_FDB/ CatalogID	ST.DA99
Product Group	2310
Group Code	R132
Country of origin	Germany
SCIP number	9e865f5c-3afc-4174-8f0f-8e1f4ac0aedd
Delivery information
Net Weight (lb)	1.764 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1641-0AC0 Siemens

$1,401.90

Only 9 units left

Product
Article Number (Market Facing Number)	6DD16410AC0 \| 6DD16410AC0
Product Description	* SPARE PART* SIMADYN D BINARY INPUT/OUTPUT MODULE EB11 32BI,32BO
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643264203
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)	1.093 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1681-0CA2 Siemens

$5,417.30

Only 7 units left

Control system SIMADYN D SITOR-interface SE20.2, mounted directly for PG16, PG26, PT20G

Siemens 6DD1640-0AD0 Siemens

$37,066.95

Only 8 units left

Product
Article Number (Market Facing Number)	6DD16400AD0 \| 6DD16400AD0
Product Description	* SPARE PART* SIMADYN D MIXED INPUT/OUTPUT MODULE EM11T GENERATOR/TURBINE CONTROL
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643034868
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)	1.239 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1607-0EA1 Siemens

$11,475.00

Only 7 units left

Product
Article Number (Market Facing Number)	6DD16070EA1 \| 6DD16070EA1
Product Description	*Spare part* SIMATIC S7-400, EXM 448-1 communication expansion with PROFIBUS DP and SLB for SIMOLINK integrated
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	4019169120548
UPC	662643265163
Commodity Code	85389091
LKZ_FDB/ CatalogID	ST9.DA99T
Product Group	4100
Group Code	R111
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	2.366 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1805-5DA0 Siemens

$0.00

Sold Out

Product
Article Number (Market Facing Number)	6DD18055DA0 \| 6DD18055DA0
Product Description	SIMATIC D7-FB Generator V2.1 incl. Service Pack 2; Single License for 1 install., E-SW, SW and documentation on CD, Class A, 2 languages (de, en), executable in Win95/98/ME/ Windows NT/2000/XP, Reference HW: SIMATIC FM458, T400, SIMATIC TDC, SIMADYN D
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	4047622752579
UPC	662643035308
Commodity Code	85234910
LKZ_FDB/ CatalogID	ST.DA99
Product Group	4119
Group Code	R132
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	0.273 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1684-0GG0 Siemens

$0.00

Sold Out

Product
Article Number (Market Facing Number)	6DD16840GG0 \| 6DD16840GG0
Product Description	* spare part * SIMATIC TDC round cable SC66 10-pole shielded, length 2 m
Product family	Not available
Product Lifecycle (PLM)	PM410:Product cancellation
Additional Product Information
EAN	Not available
UPC	662643297362
Commodity Code	85444290
LKZ_FDB/ CatalogID	ST.DA99
Product Group	4476
Group Code	R132
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	0.291 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1681-0AF4 Siemens

$2,770.08

Only 3 units left

Product
Article Number (Market Facing Number)	6DD16810AF4 \| 6DD16810AF4
Product Description	* spare part * SIMADYN D binary input SB60 8 BI, 115 DC/AC, LED display, galvanic isolation
Product family	Not available
Product Lifecycle (PLM)	PM410:Product cancellation
Additional Product Information
EAN	Not available
UPC	662643297324
Commodity Code	85389091
LKZ_FDB/ CatalogID	ST.DA99
Product Group	4476
Group Code	R132
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	0.864 lb
Package size unit of measure	Inch
Packaging Quantity	1

Previous Page 4 / 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.