PLC Communication Modules

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Siemens 6DD1640-0AH1 Siemens

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Product
Article Number (Market Facing Number)	6DD16400AH1
Product Description	SIMATIC TDC Signal module SM500 DI/DQ with 16 DA/16 DE, 6 LEDs
Product family	SM500 DI/DQ I/O module
Product Lifecycle (PLM)	PM400:Announcement of product phase-out
Additional Product Information
EAN	4047622781395
UPC	Not available
Commodity Code	85389091
LKZ_FDB/ CatalogID	ST.DA99
Product Group	2310
Group Code	R132
Country of origin	Germany
SCIP number	61de6bf6-2caf-4ef2-b6d5-a90d964a4d11
Delivery information
Net Weight (lb)	0.002 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1672-0AF0 Siemens

€6.136,95

Only 5 units left

Buy the Siemens 6DD1672-0AF0 - a genuine Siemens industrial automation component engineered for reliable performance in demanding manufacturing and process control environments. The Siemens 6DD1672-0AF0 is a direct drop-in replacement for existing installations and ships ready for integration.

Siemens 6DD2920-0AV0 Siemens

€1.356,95

Only 3 units left

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Siemens 6DD1660-0AD0 Siemens

€1.373,95

Only 4 units left

Product
Article Number (Market Facing Number)	6DD16600AD0
Product Description	SIMADYN D COMMUNICATION MODULE CS11 PARALLEL RACK COUPLING MASTER
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	85176200
LKZ_FDB/ CatalogID	ST9.DA99T
Product Group	4315
Group Code	R111
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	1.098 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1681-0AF3 Siemens

€5.264,95

Only 1 unit left

Product
Article Number (Market Facing Number)	6DD16810AF3
Product Description	SIMADYN D INTERFACE MODULE SE5.3 8BI, 230V/24V, LED GALVANIC 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)	0.637 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1681-0EH1 Siemens

€4.530,95

Only 4 units left

Product
Article Number (Market Facing Number)	6DD16810EH1
Product Description	SIMADYN D INTERFACE MODULE SE47.1 BUS INTERFACE MODULE DUST 4
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.DA97T
Product Group	4315
Group Code	R111
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	0.787 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1681-0FG0 Siemens

€1.016,95

In stock, 14 units

Product
Article Number (Market Facing Number)	6DD16810FG0 \| 6DD16810FG0
Product Description	* SPARE PART* SIMADYN D CONVERTER SU10 26-POLE 26 SCREW-PLUGIN-TERMINALS 26-POLE PLUG
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643268928
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)	0.796 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD2920-0BB0 Siemens

€3.783,95

Only 9 units left

Buy the Siemens 6DD2920-0BB0 - a genuine Siemens industrial automation component engineered for reliable performance in demanding manufacturing and process control environments. The Siemens 6DD2920-0BB0 is a direct drop-in replacement for existing installations and ships ready for integration.

Siemens 6DD1610-0AF0 Siemens

€433,95

Only 1 unit left

Product
Article Number (Market Facing Number)	6DD16100AF0
Product Description	SIMADYN D DIGITAL CONTR.SYSTEM MEMORY SUBMODULE MS3 256K BYTES EPROM
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 6DD1688-0AE2 Siemens

€946,95

Only 6 units left

Product
Article Number (Market Facing Number)	6DD16880AE2 \| 6DD16880AE2
Product Description	* SPARE PART* SIMADYN D COMMUNICATION SUBMODULE SS52 FOR CS7 , MASTER INTERFACE FOR BUS SYSTEM SINEC L2 DP
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643270105
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)	0.403 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1683-0CC0 Siemens

€7.336,95

Only 7 units left

Product
Article Number (Market Facing Number)	6DD16830CC0 \| 6DD16830CC0
Product Description	* SPARE PART* SIMADYN D POWER SUPPLY UNIT SP22 5V/25A, 15V, 24V DC INPUT WITH FAN
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	Not available
UPC	662643035162
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 6DD1600-0AD0 Siemens

€4.880,95

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 6DD1607-0AA1 Siemens

€6.791,95

In stock, 15 units

Product
Article Number (Market Facing Number)	6DD16070AA1 \| 6DD16070AA1
Product Description	*Spare part* SIMATIC S7-400, FM458-1 DP application group for SIMATIC S7-400
Product family	Not available
Product Lifecycle (PLM)	PM500:Discontinued Product or end of PLM & Support
Additional Product Information
EAN	4019169118545
UPC	662643297904
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)	2.363 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1682-0BC4 Siemens

€1.084,95

Only 3 units left

Buy the Siemens 6DD1682-0BC4 - a genuine Siemens industrial automation component engineered for reliable performance in demanding manufacturing and process control environments. The Siemens 6DD1682-0BC4 is a direct drop-in replacement for existing installations and ships ready for integration.

Siemens 6DD1681-0EB3 Siemens

€724,95

In stock, 12 units

Product
Article Number (Market Facing Number)	6DD16810EB3 \| 6DD16810EB3
Product Description	* spare part * SIMATIC TDC, binary input SB61 isolated 24/48 V, 8 BI 24 or 48 V DC, LED display galvanic isolation
Product family	Not available
Product Lifecycle (PLM)	PM410:Product cancellation
Additional Product Information
EAN	Not available
UPC	662643035049
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)	0.902 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1681-0DE1 Siemens

€1.065,95

Only 4 units left

Product
Article Number (Market Facing Number)	6DD16810DE1
Product Description	* SPARE PART* SIMADYN D INTERFACE MODULE SA30 2X8-CHANNELS REDUNDANT
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)	0.959 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1684-0GC0 Siemens

€1.924,95

Only 1 unit left

Product
Article Number (Market Facing Number)	6DD16840GC0 \| 6DD16840GC0
Product Description	* spare part * SIMATIC TDC round cable SC62, 50-pole shielded, length 2 m
Product family	Not available
Product Lifecycle (PLM)	PM410:Product cancellation
Additional Product Information
EAN	Not available
UPC	662643035230
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)	1.219 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1684-0GD0 Siemens

€898,95

Only 4 units left

Product
Article Number (Market Facing Number)	6DD16840GD0 \| 6DD16840GD0
Product Description	SIMATIC TDC Round cable SC63 50-pole shielded, length 2m
Product family	SC63 interface cable
Product Lifecycle (PLM)	PM400:Announcement of product phase-out
Additional Product Information
EAN	4025515739869
UPC	662643035247
Commodity Code	85444290
LKZ_FDB/ CatalogID	ST.DA99
Product Group	2310
Group Code	R132
Country of origin	Germany
SCIP number	Not available
Delivery information
Net Weight (lb)	0.708 lb
Package size unit of measure	Inch
Packaging Quantity	1

Siemens 6DD1688-0AF0 Siemens

€1.484,95

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 6DD1600-0AK Siemens

€4.024,95

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

€4.211,95

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

€9.017,95

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

€2.706,95

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

Previous Page 34 / 37Next

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.