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ABB PM861A Processor Module

The ABB 3BSE018158R1 PM861A, also cataloged as the PM861A Processor Module, operates as a dedicated hardware component for control execution, communication management, and I/O processing within ABB AC 800M System 800xA platforms.

Hardware Specifications

Parameter	Specification
Model	PM861A
Brand	ABB
Origin	Sweden
Product Type	Processor Module
Spare Model	3BSE018158R1
Processor	MPC8245
RAM Memory	16 MB ECC protected
Flash Memory	8 MB
Execution Performance	Approx. 0.5 ms standard instruction execution
Ethernet Interface	2 x 10/100 Base-TX ports
Serial Interface	2 x RS-232C ports
Power Supply	24 VDC
Communication Bus	CEX Bus for communication module expansion
CPU Redundancy	Supported with redundancy link and matching processor module
Protection Class	IP20
Dimensions	Approx. 115 mm W x 185 mm H x 135 mm D
Weight	Approx. 0.5 kg
Operating Temp	+10 deg C to +55 deg C
Power Consumption	Not specified

ABB AC 800M Backplane and Network Integration

The PM861A operates as an AC 800M controller processor and exchanges data through the controller backplane and communication interfaces. Furthermore, the module supports CEX Bus expansion for additional communication units, including CI series interfaces. The processor manages application execution, I/O data exchange, and system communication functions through configured ABB Control Builder applications.

The module supports industrial control network functions through dual Ethernet ports. Therefore, it can handle MMS communication, engineering tool connections, and System 800xA control network traffic. The RS-232C interfaces provide configurable serial communication channels for supported external devices.

For ABB industrial control architectures, the PM861A uses firmware-controlled execution with flash memory storage. In addition, the ECC protected RAM structure provides memory error detection during processor operation.

Frequently Asked Questions

Q: Does the PM861A support CPU redundancy configuration?
A: Yes. The PM861A supports processor redundancy when installed with a matching processor module and a dedicated redundancy communication link.

Q: Which communication expansion method does the PM861A use?
A: The PM861A uses the CEX Bus interface for connection of compatible ABB communication modules.

Q: Can the PM861A communicate with serial field devices?
A: Yes. The processor includes two RS-232C serial ports that can be configured for supported serial communication functions.

Field Installation Guidelines

Install the PM861A in an ABB AC 800M controller assembly with the correct mounting position and approved hardware configuration. Verify that the module is properly seated on the controller backplane before applying power.

Use shielded communication cables for external network connections where required by the installation environment. Connect cable shields according to the site grounding standard to reduce electrical interference.

Maintain proper separation between communication wiring and high-voltage power cables. Confirm that the 24 VDC supply wiring follows the polarity and grounding requirements defined for the AC 800M controller system.

Before commissioning, verify firmware compatibility, controller configuration, communication module installation, and I/O addressing through the ABB engineering environment.

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