AC 800M - Controller Hardware - ABB

The baseplate, which is always mounted onto the DIN-rail, carries the majority of the connections to processor, power supplies and communication interfaces, as well as the connections to the external buses and systems.

The AC 800M Controller provides a cost-effective, low-maintenance solution for applications ranging from small Programmable Logic Controller (PLC) to advanced Distributed Control Systems (DCS) control applications and combined DCS, and High Integrity systems control applications.

In the AC 800M High Integrity Controller, it is possible to run both non-SIL and SIL classified applications. The AC 800M HI consist of PM865, SM810/SM811 and a High Integrity version of Control Software, and is also available in redundant configuration. AC 800M HI requires the use of SIL certified S800 I/O units in SIL classified applications. If the application is not SIL classified, standard S800 I/O units can be used with AC 800M HI controller.

shows the physical appearance of an AC 800M Controller with an  S800 I/O Unit. This physical appearance does not apply to PM891.

Figure 1. Example of an AC 800M Controller (except PM891) with an S800 I/O Unit Figure 

2 shows the PM861 processor unit that is part of the AC 800M controller. This processor unit is different from PM891.

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