ABB AC 800M controllers – ABB 800xA DCS

AC 800M can be defined as a hardware platform consisting of individual hardware
units. AC 800M hardware platform can be programmed to perform multiple
functions, depending on the specific unit configuration and operating system
selected.
The hardware units which form the AC 800M Controller are:
• Processor units (including base plates)
• Communication interfaces for different protocols (including base plates)
• Power supply units, providing various power output levels
• Battery back-up unit
• For High Integrity systems control applications with AC 800M HI, special
module SM810/SM811, is needed
Once configured, the AC 800M hardware platform effectively becomes
the AC 800M Controller.

Some of the benefits of the AC 800M Controller are:
• Flexibility, the AC 800M Controller can be ordered as individual units which may be mounted in accordance with the customers own requirements.
• Extremely small footprint.
• Simple DIN rail attachment / detachment procedures, using the unique slide & lock mechanism.
• Modularity, allowing for step-by-step expansion. You only pay for what you require at the present time.
• Reliability and simple fault diagnosis procedures.
• Controller redundancy for higher availability (CPU, CEX-Bus, communication interfaces, S800 I/O).
• Built-in redundant Ethernet Communication ports.
• Built-in RS-232C communication ports.
• Low power consumption, thus no external fans required.
• Flexible process connection, using either local I/O or standard fieldbuses.
• S800 I/O redundancy.
• Supports S800 I/O High Integrity (with PM865 only).

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Processor Unit – General

PM851 is equivalent to PM856 unless stated otherwise.
PM861A and PM864A are equivalent to PM861 and PM864 respectively, unless stated otherwise.

The processor unit (except PM891) consists of two parts:
• Processor unit,
PM851/PM851A/PM856/PM856APM860/PM860A/PM861/PM861A/PM864
/PM864A/PM865/ PM866, equipped with power supply and CPU-boards

The PM865 processor unit is prepared for High Integrity applications. When used for non-High Integrity applications, it is equivalent to the PM864 processor unit.
• Base plate, TP830, with a unit termination board.
The PM891 processor unit is a monolithic unit equipped with power supply and CPU-boards, and unit termination.
The CPU board contains the microprocessor and the RAM-memory. The memory holds an executable version of the firmware, the controller system configuration and an application program.
The processor unit also has an optical ModuleBus used for connecting additional clusters of S800 I/O, and a connector housing for a plug-in backup media (Secure Digital card for PM891, and Compact Flash card for other processor units).
PM851 is equivalent to PM856 unless stated otherwise.
PM861A and PM864A are equivalent to PM861 and PM864 respectively, unless stated otherwise.
The PM865 processor unit is prepared for High Integrity applications. When used for non-High Integrity applications, it is equivalent to the PM864 processor unit.

• Base plate, TP830, with a unit termination board.
The PM891 processor unit is a monolithic unit equipped with power supply and CPU-boards, and unit termination.
The CPU board contains the microprocessor and the RAM-memory. The memory holds an executable version of the firmware, the controller system configuration and an application program.
The processor unit also has an optical ModuleBus used for connecting additional clusters of S800 I/O, and a connector housing for a plug-in backup media (Secure Digital card for PM891, and Compact Flash card for other processor units).

PM8xx Unit (Except PM891)

The base plate of PM8xx unit (except PM891) has two RJ45 Ethernet ports (CN1, CN2) for connection to the Control Network, and two RJ45 serial ports (COM3, COM4). One of the serial ports (COM3) is an RS-232C port with modem control signals, whereas the other port (COM4) is isolated and used for the connection of a configuration tool.

Note that a PM851/PM851A is restricted to one Ethernet (CN1) port, thus
redundant Ethernet is not available.
Both the electrical ModuleBus and the communication expansion bus (CEX-Bus) connectors are mounted on the base plate. The built-in electrical ModuleBus can be used in single CPU configuration for connecting one cluster of S800 I/O units directly to the base plate (maximum number of units per cluster is 12). However, an additional seven clusters (each comprising up to 12 units) can be added to the optical ModuleBus.