ABB PM856 3BSE018128R1 AC 800M Processor Unit

Product Description

The ABB PM856 (3BSE018128R1) is a powerful processor module within the AC 800M family of controllers, designed for high-performance industrial control applications. It supports modular expansion, integrated communication, and redundant operation. The PM856 is suitable for both standalone and distributed systems across various industries such as power, oil & gas, and manufacturing.

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Technical Specifications

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Applications

• Distributed control systems in process industries

• Batch control for chemical and pharmaceutical plants

• Safety-integrated automation for power and energy systems

• Integrated control in pulp and paper manufacturing

• High-reliability control in oil & gas operations

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Product Advantages

• Scalable and modular architecture for flexible system design

• Built-in support for CPU and communication redundancy

• Integrated Ethernet and RS-232 communication interfaces

• Reliable memory retention with optional external battery backup

• Simple DIN rail mounting and compact design

• Low power consumption, no active cooling required

• Full support for ABB’s S800 I/O system

• Broad protocol support via CEX-Bus (PROFIBUS, Modbus TCP, FF, etc.)

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Frequently Asked Questions (FAQ)

Q1: Does PM856 support redundant CPU configuration?
A1: Yes, it supports hot-standby redundancy using RCU Link cable (TK851).

Q2: What I/O modules are compatible with PM856?
A2: It supports S800 I/O (electrical and optical), as well as extensions via CEX-Bus to other I/O interfaces.

Q3: Is the internal battery replaceable?
A3: No, but you can use the SB821 external battery for extended backup time.

Q4: Does PM856 require active cooling?
A4: No fan is needed; its design ensures passive cooling under normal conditions.

Q5: Which software tool is used for configuration?
A5: ABB Control Builder, part of the 800xA system, is used for configuration and programming.

Q6: How is firmware updated?
A6: Firmware is loaded through COM4 (serial) or CN1/CN2 (Ethernet) using Control Builder.

Q7: What is the maximum number of I/O clusters supported?
A7: One electrical cluster and up to seven optical clusters (12 modules each).

Q8: Can PM856 connect to IEC 61850 networks?
A8: Yes, with the CI868 communication interface module via CEX-Bus.

Q9: Is it certified for hazardous locations?
A9: Yes, PM856 complies with UL60079-15 for Class I, Zone 2 environments.

Q10: What type of memory card does PM856 use?
A10: It uses a CompactFlash card for backup and firmware storage.

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