SIEMENS SIMATIC S5 Modules – 16804-42

Name: SIEMENS SIMATIC S5 Modules – 16804-42
Brand: Siemens

Model: 16804-42

Brand Siemens

Series 16804-42

Model 16804-42

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Product Details And Specifications

Siemens SIMATIC S5 Series Technical Notes

The Siemens SIMATIC S5 programmable controller family represents one of the most widely deployed automation platforms in global heavy industry. Installed across petrochemical refineries, nuclear power stations, chemical processing plants, and continuous-casting steel mills, the S5 series established the architectural baseline for modern DCS and PLC integration. The 16804-42 is a representative electrical interface module within this ecosystem, providing signal conditioning and bus-level electrical isolation between field devices and the S5 backplane. Despite the series entering its end-of-production phase, the installed base remains substantial, with lifecycle support requirements extending well into the 2030s at many facilities.

The Evolution of SIMATIC S5 Architecture

The SIMATIC S5 architecture was introduced in the late 1970s and underwent continuous revision through the 1990s. Early variants — including the S5-90U, S5-95U, and S5-100U — used a compact, fixed-I/O format. The mid-range S5-115U and high-end S5-135U/S5-155U introduced modular backplane designs with multi-rack expansion capability via the SINEC H1 and SINEC L2 bus systems. The S5-135U and S5-155U in particular became the standard for large-scale process control in refinery and power generation environments, supporting up to 256 I/O modules per CPU rack configuration.

Compatibility across generations is constrained by backplane bus voltage levels, slot addressing schemes, and firmware revision dependencies. Modules from the S5-115U sub-family are generally not interchangeable with S5-135U/155U racks without adapter hardware. Interface modules such as the 16804-42 serve as the electrical boundary layer, and their specifications must be matched precisely to the host rack's bus standard. As Siemens formally discontinued S5 production in 2013, sourcing these interface modules from certified secondary-market suppliers has become the primary maintenance strategy for plant operators.

SIMATIC S5 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly referenced modules within the SIMATIC S5 product family, organized by functional category:

CPU Modules

6ES5 095-8MA02: S5-95U CPU with integrated I/O and SINEC L2 interface.
6ES5 100-8MA02: S5-100U compact CPU, 1K program memory, 8 DI/8 DO onboard.
6ES5 115-8MA02: S5-115U modular CPU, 48K RAM, multi-rack capable.
6ES5 135-8MA02: S5-135U high-performance CPU, 256K RAM, dual-port memory.
6ES5 155-8MA02: S5-155U top-tier CPU, redundancy-capable, used in nuclear and refinery SCADA.

Digital Input (DI) Modules

6ES5 420-8MA11: 16-channel 24VDC digital input, isolated, S5-115U/135U compatible.
6ES5 421-8MA11: 16-channel 120VAC digital input, field-level isolation, refinery-grade.
6ES5 430-8MA11: 32-channel 24VDC digital input, high-density rack format.
6ES5 431-8MA11: 32-channel 120VAC digital input, CE-marked, IEC 61131-2 compliant.

Digital Output (DO) Modules

6ES5 440-8MA11: 16-channel 24VDC/0.5A transistor output, short-circuit protected.
6ES5 441-8MA11: 16-channel relay output, 230VAC/2A, mechanical contact, fail-safe rated.
6ES5 451-8MA11: 32-channel 24VDC transistor output, sink type, high-speed switching.

Analog Input (AI) Modules

6ES5 464-8MA11: 8-channel analog input, ±10V / 0–20mA, 12-bit resolution.
6ES5 465-8MA11: 4-channel thermocouple input, type J/K/T, cold-junction compensated.

Analog Output (AO) Modules

6ES5 470-8MA12: 4-channel analog output, 0–20mA / 4–20mA, 11-bit resolution.

Interface & Communication Modules

16804-42: Electrical interface module; provides bus-level signal isolation and electrical decoupling between field wiring and S5 backplane bus.
6ES5 308-3UA11: Power supply unit, 24VDC/4A, for S5-115U/135U rack.
6ES5 955-3LC41: 24VDC/10A regulated PSU, redundancy-capable, for S5-155U systems.
6ES5 734-1BD20: SINEC L2 communications processor, RS-485, peer-to-peer networking.
6ES5 095-8MB01: S5-95U with integrated PROFIBUS-DP interface, field bus master.

Sourcing Hard-to-Find & Obsolete SIMATIC S5 Parts

Siemens officially ended S5 series production in 2013 and terminated extended support contracts in 2020. For plant operators running continuous processes — where a control system shutdown carries costs measured in millions per hour — replacement with SIMATIC S7 or S7-1500 is not always operationally feasible on short notice. DriveKNMS maintains a dedicated inventory of S5 modules, including interface modules such as the 16804-42, sourced from decommissioned plant equipment, certified refurbishment programs, and verified surplus channels.

Quality Control for the SIMATIC S5 Range

SIMATIC S5 modules present specific test challenges due to their proprietary backplane bus architecture and age-related component degradation. DriveKNMS applies a structured test protocol for all S5 units prior to dispatch:

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