Overview
Manuals
Configuration Considerations
Selection & Replacement Notes
Features:
- Reliability and simple fault diagnosis procedures
- 2IP20 Class protection without the requirement for enclosures
- Built-in redundant Ethernet Communication ports
The PM891 processor is a monolithic unit equipped with power supply, CPU-boards and unit termination. The unit contains microprocessor and RAM memory, a real-time clock, LED indicators, INIT push button and a Secure Digital interface. The PM891 does not contain any internal battery The PM891 has two RJ45 Ethernet ports (CN1, CN2) for connection to the Control Network, and one RJ45 serial port (COM4). The COM4 port is isolated and used for a configuration tool. The PM891 supports CPU redundancy for higher availability (CPU, CEX-Bus, communication interfaces and S800 I/O).
The communication expansion bus (CEX-Bus) is mounted on the unit. The CEX-Bus is used for extending the on-board communication ports with communication interface units. It is possible to use redundant communication interfaces on the CEX-Bus. The CEX-Bus Interconnection unit BC810 is used to increase the availability on the CEX-Bus by dividing it into separate segments. The optical Modulebus of the unit can be used for connecting seven clusters of S800 I/O units (each comprising up to 12 units). Each PM891 is provided with a unique Ethernet address which provides hardware identity to the unit.
The ABB PM891K02 3BSE053242R1 Redundant Processor Unit is supported by Moore Automated for verified industrial replacement and spare-part requirements.
ABB PM891K02 3BSE053242R1 Redundant Processor Unit manual(Datasheets), Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
PM891K02 is supplied as a redundant processor package containing 2 × PM891K01 Processor Units, 1 × TK850V007 CEX-bus Extension Cable, 1 × TK855 RCU Data Link Cable, and 1 × TK856 RCU Control Link Cable. ABB specifically notes that BC810K02 is not included in the PM891K02 kit; BC810K02 must be ordered separately when hot replacement of the PM891 Processor Unit is required. The PM891 also has two RJ45 Ethernet ports for the Control Network, one isolated RJ45 COM4 serial port for a configuration tool, and an onboard CEX-Bus for communication expansion.
When selecting PM891K02, verify the complete identification PM891K02 / 3BSE053242R1 rather than relying only on the PM891 family designation. It is particularly important to distinguish the redundant PM891K02 kit from the single PM891K01, whose article number is 3BSE053241R1. For replacement projects, the existing controller configuration, redundancy arrangement, CEX-Bus interfaces, S800 I/O architecture, and required accessories should be checked against the intended PM891K02 configuration. ABB's current official selector continues to list PM891K02 and provides current product data.
