Siemens TELEPERM M APF120 Modules

Technical Dossier

Product Details And Specifications

Siemens TELEPERM M Series: Comprehensive Module Range and Technical Overview

The Siemens TELEPERM M system is a distributed control system (DCS) platform deployed extensively across global heavy industry sectors, including petrochemical refineries, nuclear power stations, chemical processing plants, and offshore oil & gas facilities. Introduced in the 1980s and progressively expanded through the 1990s, TELEPERM M established itself as one of the most widely installed process control architectures in Europe and Asia. Its modular backplane design, deterministic bus communication, and high-availability redundancy options made it the reference standard for continuous-process industries requiring 24/7 uptime. Installed base estimates place TELEPERM M hardware in thousands of facilities globally, with many sites still operating original hardware under long-term maintenance contracts. The 6DP1120-8BA (APF120) is a function module within this ecosystem, classified under the analog processing function group.

The Evolution of TELEPERM M Architecture

TELEPERM M was designed around a hierarchical, rack-based architecture using the SINEC H1 industrial Ethernet backbone for supervisory communication and a proprietary parallel backplane bus for inter-module data exchange within each rack. Early generations (circa 1983–1990) relied on discrete analog signal conditioning with 4–20 mA loop interfaces and hardwired I/O marshalling. The mid-generation expansion (1990–1998) introduced enhanced function modules with onboard microprocessors, enabling local PID computation, signal linearization, and self-diagnostics without burdening the central processor. The APF120 (6DP1120-8BA) belongs to this mid-to-late generation, providing analog processing functions directly at the I/O level. Compatibility across TELEPERM M generations is constrained by backplane slot addressing and firmware revision levels; mixing early-generation passive modules with later active function modules requires careful rack configuration validation. Siemens officially discontinued new production of TELEPERM M hardware, transitioning customers toward SIMATIC PCS 7 and later DCS platforms. However, the installed base remains active, and backward-compatible spare parts remain critical for brownfield plant operations.

TELEPERM M Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly referenced modules within the Siemens TELEPERM M platform. Modules are grouped by functional category.

Analog Processing Function Modules (APF)

• 6DP1120-8BA: APF120 — Analog processing function module, signal conditioning and loop control
• 6DP1121-8BA: APF121 — Analog processing function module, extended range variant
• 6DP1110-8BA: APF110 — Analog input processing, 4–20 mA, 8-channel
• 6DP1130-8BA: APF130 — Analog output processing, 4–20 mA, 4-channel
• 6DP1140-8BA: APF140 — Analog function module with PID control block

Digital Input/Output Modules (DI/DO)

• 6DP1610-8BA: Digital input module, 24 VDC, 16-channel, isolated
• 6DP1620-8BA: Digital output module, 24 VDC, 16-channel, relay contact
• 6DP1630-8BA: Digital I/O combination module, 8DI / 8DO, 24 VDC
• 6DP1640-8BA: High-density digital input module, 32-channel, 24 VDC

Central Processing Units (CPU)

• 6DP1700-8BA: Central processing unit, TELEPERM M main controller, single CPU
• 6DP1701-8BA: Redundant CPU module, hot-standby configuration
• 6DP1702-8BA: CPU module with extended memory, for large-scale loop configurations

Communication & Bus Adapters

• 6DP1900-8BA: SINEC H1 communication adapter, Ethernet interface module
• 6DP1910-8BA: PROFIBUS-DP gateway module for TELEPERM M backplane
• 6DP1920-8BA: Serial communication module, RS-232/RS-485 dual-port

Power Supply Modules (PS)

• 6DP1500-8BA: Power supply module, 24 VDC input, rack-mounted, 10 A output
• 6DP1501-8BA: Redundant power supply module, automatic switchover, 10 A

Sourcing Hard-to-Find & Obsolete TELEPERM M Parts

Siemens ceased volume production of TELEPERM M modules, placing the entire product line in end-of-life (EOL) status. For plant operators running TELEPERM M systems, this creates a critical spare parts challenge: standard distribution channels no longer stock these modules, and lead times through legacy Siemens service contracts can extend to 6–18 months. DriveKNMS maintains a dedicated inventory of TELEPERM M hardware sourced through certified industrial surplus channels, decommissioned plant buybacks, and long-term storage stock. All units are catalogued by part number, firmware revision, and physical condition grade. For the 6DP1120-8BA specifically, DriveKNMS holds stock across multiple hardware revisions to ensure backplane compatibility with customer-specific rack configurations. Customers requiring cross-reference validation between obsolete TELEPERM M part numbers and available substitutes can submit their BOM (Bill of Materials) directly for engineering review. DriveKNMS also supports lifecycle extension planning, including failure mode analysis for aging TELEPERM M backplanes and bus termination components.

Quality Control for the TELEPERM M Range

TELEPERM M modules present specific test challenges due to their proprietary backplane bus protocol and analog signal conditioning circuitry. DriveKNMS applies a structured test protocol for all TELEPERM M inventory. Each module undergoes visual inspection for capacitor degradation, PCB corrosion, and connector pin integrity — failure modes common in modules stored beyond 10 years. Functional testing is performed using a TELEPERM M-compatible rack test bench that replicates the backplane bus timing and slot addressing of the original system. Analog modules including the 6DP1120-8BA are tested for signal linearity across the full 4–20 mA input range, offset calibration accuracy, and response time under simulated loop load. Digital modules are verified for channel isolation resistance and switching response time. Communication modules are tested for bus arbitration behavior and frame error rates under continuous traffic simulation. All tested units are issued a condition report and assigned a grade (Tested/Functional, Refurbished, or For-Parts) prior to dispatch.

© 2026 DriveKNMS. All trademarks belong to their respective owners. Specifications are for reference only and subject to change without notice. Verify all parameters against official documentation before installation.