MOORE APACS+ Modules: 39ACM28AEN 16139-218

Technical Dossier

Product Details And Specifications

MOORE APACS+ Series: Comprehensive Module Range and Technical Overview

The MOORE APACS+ (Advanced Process Automation Control System) platform is a distributed control system (DCS) architecture developed by Moore Products Co. (later acquired by Siemens). It has been deployed extensively in global heavy industry sectors including petrochemical refineries, nuclear power generation facilities, chemical processing plants, and offshore oil & gas platforms. The system's modular backplane architecture, deterministic scan cycle, and redundancy support made it a standard-bearer for process control in the 1990s and 2000s. Installed base remains active across North America, Europe, and the Middle East, with many facilities operating the platform under long-term maintenance contracts well beyond its official end-of-life designation.

The Evolution of APACS+ Architecture

The APACS+ platform evolved from Moore Products' earlier APACS (Advanced Process Automation and Control System) line introduced in the late 1980s. The original APACS used a proprietary SAINET fieldbus for inter-module communication. The APACS+ generation, released in the early 1990s, introduced an enhanced backplane bus with higher throughput, improved CPU processing speed, and expanded I/O density per rack.

Key architectural milestones:

• APACS (Gen 1, ~1988–1992): Proprietary SAINET bus, 8-slot racks, limited redundancy options.
• APACS+ (Gen 2, ~1992–2002): Enhanced backplane, 16-slot rack support, hot-standby CPU redundancy, expanded analog I/O resolution to 16-bit.
• APACS+ with QUADLOG (Safety Layer, ~1995–2005): Integration of SIL 2/3 safety logic solver modules on the same backplane infrastructure.
• Siemens Migration Path (~2005–present): Following Siemens' acquisition of Moore Products, the APACS+ platform was officially designated end-of-life. Siemens offered migration to the SIMATIC PCS 7 platform. However, the high cost and complexity of migration has resulted in a large installed base continuing to operate APACS+ hardware, creating sustained demand for spare parts and replacement modules.

Compatibility note: APACS and APACS+ modules are not cross-compatible at the backplane level. APACS+ modules require APACS+ racks and power supplies. Mixing generations will result in communication faults.

APACS+ Full Catalog & Functionalities (SKU List)

CPU / Controller Modules

• 39ACM28AEN 16139-218: Advanced Control Module, dual-port Ethernet, hot-standby redundancy capable, primary process controller for APACS+ racks.
• 39ACM28A 16139-200: Advanced Control Module, standard variant, single Ethernet port, non-redundant configuration.
• 39ACM28B 16139-210: Advanced Control Module Rev B, enhanced memory capacity, supports larger ladder/function block programs.
• 39ACM28C 16139-220: Advanced Control Module Rev C, extended temperature range, improved EMI shielding.

Analog Input (AI) Modules

• 39AIM8 16102-100: 8-channel analog input, 4–20 mA / 1–5 VDC, 16-bit resolution, HART pass-through capable.
• 39AIM16 16102-200: 16-channel analog input, high-density configuration, 4–20 mA, field-side isolation per channel.
• 39AIM8H 16102-150: 8-channel analog input with integrated HART communication, supports HART revision 5/6.

Analog Output (AO) Modules

• 39AOM8 16103-100: 8-channel analog output, 4–20 mA, 16-bit DAC, loop-powered field devices supported.
• 39AOM8H 16103-150: 8-channel analog output with HART pass-through, field device diagnostics via HART.

Digital Input (DI) Modules

• 39DIM16 16104-100: 16-channel digital input, 24 VDC, optically isolated, configurable for sourcing or sinking.
• 39DIM32 16104-200: 32-channel digital input, high-density, 24 VDC, group isolation.

Digital Output (DO) Modules

• 39DOM16 16105-100: 16-channel digital output, 24 VDC, 0.5 A per channel, short-circuit protected.
• 39DOM16R 16105-150: 16-channel relay output, SPDT contacts, 2 A @ 250 VAC, for high-current switching applications.

Communication / Network Modules

• 39NIM 16120-100: Network Interface Module, SAINET/Ethernet bridge, connects APACS+ racks to plant-level DCS network.
• 39RIM 16121-100: Remote I/O Module, extends I/O capacity to remote rack locations via fiber or copper link.

Power Supply Modules

• 39PSM 16130-100: Power Supply Module, 24 VDC input, 5 VDC / 3.3 VDC backplane output, redundant pair capable.
• 39PSM-R 16130-200: Redundant Power Supply Module, hot-swap capable, automatic failover, status LED and relay contact output.

Sourcing Hard-to-Find & Obsolete APACS+ Parts

The APACS+ platform reached official end-of-life under Siemens' product lifecycle policy. New production of APACS+ modules ceased, and OEM support contracts are no longer available through standard channels. This creates a critical supply gap for facilities that have not yet completed migration to a successor platform.

DriveKNMS maintains a dedicated inventory of APACS+ spare parts sourced through authorized secondary market channels, decommissioned plant buybacks, and certified refurbishment programs. Our inventory covers the full APACS+ module range including CPU controllers, I/O modules, network interfaces, and power supplies.

Services provided for APACS+ lifecycle extension:

• Genuine pull-out modules tested to OEM functional specifications.
• Refurbished modules with documented repair history and 12-month warranty.
• Emergency same-day dispatch for critical plant shutdowns.
• Long-term supply agreements for facilities with multi-year maintenance plans.
• Cross-reference support: identification of compatible substitute modules where direct replacements are unavailable.

Quality Control for the APACS+ Range

APACS+ modules present specific test challenges due to their proprietary backplane bus protocol and multi-layer PCB construction. DriveKNMS applies the following test procedures to all APACS+ inventory:

• Backplane Communication Test: Each module is seated in a live APACS+ test rack and verified for correct backplane enumeration and data exchange with a reference ACM controller.
• Functional I/O Verification: All analog channels are tested at 0%, 25%, 50%, 75%, and 100% of rated range. Digital channels are cycled through ON/OFF states under rated load.
• HART Protocol Test (for HART-capable modules): HART commands 0, 1, 3, and 48 are executed to verify device descriptor, process variable, and diagnostic data transmission.
• Power Supply Load Test: PSM modules are tested under 80% rated load for 30 minutes minimum, with output voltage ripple measured at <50 mV peak-to-peak.
• Thermal Cycling: Modules flagged as refurbished undergo 0°C to 60°C thermal cycling (3 cycles) prior to final acceptance.
• Visual and Component Inspection: PCB inspection for corrosion, cold solder joints, capacitor bulge, and connector pin integrity.