Siemens SIMATIC S5 1201PXM Modules

Technical Dossier

Product Details And Specifications

Siemens SIMATIC S5 Series Technical Notes

The Siemens SIMATIC S5 programmable controller platform has been deployed across the full spectrum of global heavy industry since its introduction in the late 1970s. Chemical processing plants, nuclear power facilities, petroleum refineries, steel mills, and water treatment infrastructure across Europe, Asia, and the Americas have standardized on S5 hardware for process automation, machine control, and safety-critical sequencing. The 1201PXM is a peripheral expansion module within this architecture, designed to extend the I/O capacity of S5-based control systems through the S5 bus backplane. Its continued presence in active plant environments — decades after Siemens formally discontinued the S5 line — reflects the long asset lifecycles typical of heavy industrial installations. DriveKNMS maintains a dedicated inventory of S5 series modules to support these long-running installations.

The Evolution of SIMATIC S5 Architecture

The SIMATIC S5 family was introduced by Siemens in 1979 and underwent continuous hardware revision through the mid-1990s. The platform spans multiple sub-families — S5-90U, S5-95U, S5-100U, S5-115U, S5-135U, and S5-155U — each targeting a distinct scale of control application from compact standalone machines to large distributed process control systems. The S5 bus (also referred to as the SINEC L1 or P bus depending on configuration) defines the backplane communication protocol, and all peripheral modules including the 1201PXM are designed to operate within this bus architecture. Siemens announced the official end-of-life for the S5 product line in 1994, with extended support running through the early 2000s. Migration paths to the SIMATIC S7-300 and S7-400 platforms were provided, but a significant installed base remains in service due to the cost and complexity of full system replacement. Compatibility between S5 sub-families is constrained by backplane form factor, bus protocol version, and power supply ratings — cross-family substitution requires engineering validation.

SIMATIC S5 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified components within the Siemens SIMATIC S5 platform. Each entry reflects a distinct hardware function within the S5 control architecture.

Controllers & CPUs

6ES5095-8MA02: S5-95U compact CPU with integrated I/O and serial interface.
6ES5100-8MA02: S5-100U CPU module for modular rack-based configurations.
6ES5115-3UA11: S5-115U CPU with extended memory and multi-rack support.
6ES5135-3UA41: S5-135U high-performance CPU for large-scale process control.
6ES5155-3UA11: S5-155U CPU module for maximum I/O expansion and redundancy.

Digital Input Modules (DI)

6ES5421-8MA11: 16-channel 24VDC digital input module for S5-100U rack.
6ES5431-8MA11: 16-channel 120VAC digital input module, S5-100U compatible.
6ES5482-8MA11: 32-channel 24VDC digital input, high-density S5-115U format.

Digital Output Modules (DO)

6ES5441-8MA11: 16-channel 24VDC transistor output module, S5-100U rack.
6ES5451-8MR11: 16-channel relay output module, 230VAC/2A per channel.
6ES5492-8MA11: 32-channel 24VDC digital output, S5-115U high-density format.

Analog Input/Output Modules (AI/AO)

6ES5464-8MA11: 4-channel analog input, 0–10V / 4–20mA, 12-bit resolution.
6ES5470-8MA12: 4-channel analog output, 0–10V / 4–20mA, 11-bit resolution.
6ES5466-8MA11: 8-channel analog input module for S5-115U/135U racks.

Communication & Interface Modules

6ES5521-8MA22: SINEC L1 communication processor for peer-to-peer S5 networking.
6ES5524-3UA15: CP 524 communications processor, SINEC H1 Ethernet interface.
6ES5525-3UA21: CP 525 module for PROFIBUS-DP master/slave communication.

Peripheral Expansion Modules

1201PXM: Peripheral expansion module for extending S5 I/O bus capacity across sub-racks.

Power Supply Modules

6ES5955-3LC41: 24VDC/4A regulated power supply for S5-100U/115U racks.
6ES5955-3NC41: 24VDC/10A power supply module for S5-135U/155U large-frame racks.