ABB 3BSE066495R1 PM860AK01 (AC800F module) controller

Description

PM860AK01 This section describes the basic system testing performed by the main CPU.

Most test and diagnostics information is available as safety messages and in system status

displays on the operator station. If a serious fault does occur, and the system is not considered

reliable, the CPU will be halted, and diagnostic PM860AK01 information is presented on the CPU board

front.

Indicators on the CPU board front include power status, halt (system stopped), stall (watchdog

time-out), and a two-digit system status display. With these indicators, and indications on the

I/O boards, most errors are diagnosed simply by PM860AK01 locating the red error indicators. The same

status, including more detailed diagnostic messages are also available on operator station

displays.

Further information in this state can be obtained with the Advant Station 100 or 500 Series

Engineering Station.

PM860AK01 Basic system tests include:

• CPU Instruction set test
• CPU Illegal instruction trap
• CPU watchdog, high and low level (Fail, Infinite loop, overload)
• Bus backplane supervision, address error, bus time-out (no response)
• Dynamic RWM error detection and correction
• System clock supervision
• CRC sign calculation on system software modules
• CRC sign calculation on application database and AMPL program
• Task execution supervision
• Operating system call error detection
• Communication handlers (ISO OSI 7-layer model)
• Peripheral driver diagnostics.
• Power supply fail
• Cabinet fan fail, over-temperature.

For dangerous errors, such as program system illegal execution, appropriate actions and

reporting are taken directly by the operating system. In less serious situations, the status is also

available to the application program, which can PM860AK01 decide on the correct action to take. Some

safety applications may for example allow execution to continue when communication to other

systems is lost, while others would regard this as a shutdown condition.

The result of a serious system fault is to shut down operation and halt the CPU. This action will

cause the CPU Run status line to fall (i.e. go to zero) and de-energize all outputs.

It is important to note that the main function of the basic tests is to ensure that all hardware

components are operable, that the firmware and application software is executing and is not

corrupted by spurious changes. It is therefore not necessary to design additional test programs,

(for example pattern tests with output vector comparison PM860AK01 of the logic) to ensure that the safety

system has not changed.

2.1.6 Master Vote 3000 safety outputs

There are two types of Master Vote 3000 connection PM860AK01 units. DSTD N020 is for normally

energized outputs and DSTD N021 is for normally de-energized outputs. They have a fail-to

safe design and support a 1 out of 2 voting system. The functions on the units are continuously

supervised and tested by the Safeguard 400 Series system software.

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