ABB PM861 3BSE018129R1 AC 800M Processor Unit

Frequently Asked Questions (FAQ)

Q1: Does PM861 support redundancy?
A1: Yes, it supports CPU redundancy (hot-standby), Ethernet redundancy, and communication interface redundancy.

Q2: What types of I/O modules can PM861 connect to?
A2: It supports S800 I/O via optical ModuleBus, and S100/S900 I/O through CEX communication modules.

Q3: Can PM861 be used for SIL applications?
A3: PM861 alone does not support SIL3. SIL applications require the addition of safety modules like SM810/SM811.

Q4: Is there a backup storage slot in PM861?
A4: Yes, it has a CompactFlash slot for firmware, configuration, and application storage.

Q5: What are COM3 and COM4 ports used for?
A5: COM3 is for RS-232 communication (e.g., Modbus), and COM4 is for tool connection and configuration.

Q6: How can PM861 connect to remote I/O?
A6: Through communication modules like CI854 (PROFIBUS), CI865 (Satt I/O), CI862 (TRIO I/O), etc.

Q7: What power supply does PM861 require?
A7: It requires 24 VDC, supplied through the TP830 base plate and supports power supervision signals (SA/SB).

Q8: What happens if the primary processor fails?
A8: In redundant mode, it automatically switches to the backup CPU within 10 ms, maintaining output states.

3BSE018129R1 ABB AC 800M Processor Unit PM861

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