ABB AC800M 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).

 

The major features of the AC 800M are:
• High performance and large application memory.
• Extensive availability.
• CPU redundancy (PM861/PM864/PM865/PM866,PM891).
• AC 800M High Safety Integrity Level 2 certified using PM865/SM810/SM811.
• AC 800M High Safety Integrity Level 3 certified using PM865/SM811.
• Built-in redundant Ethernet channels.
• Built-in RS-232C channels.
• Sectioned CEX-Bus using a pair of BC810.
• Quick and simple fault-finding with the aid of LEDs on each unit / channel.
• Built-in battery back-up of memory (except for PM891).
• External battery back-up.
• Use of industry standard power supply voltage – 24V d.c.
• Easy mounting on standard DIN rail.
• IP20 Class protection without the requirement for enclosures.
• Incorporation of a wide variety of communication possibilities.
• Hardware based on standards for optimum communication connectivity (Ethernet, PROFIBUS DP).
• Support for PROFIBUS DP fieldbus.
• Support for FOUNDATION Fieldbus.
• Support for Advant Fieldbus 100.
• Support for Modbus TCP.
• Support for Field Device Tool (FDT) and Device Type Manager (DTM) concept for tool routing of HART instruments.
• Support for connection to INSUM via Gateway (Ethernet/LON).

 

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.