ABB PM861A Processor Unit

ABB PM861A Processor Unit

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The security byte triggers the smart transmitters to take configuration commands only from the module, unless the FEC module turns the transmitter off-line. The security byte locks out configuration commands from other operator interface devices such as a Type STT03 smart transmitter terminal. 

All devices can monitor the transmitter. When the transmitter receives the security byte, it sets a two-minute timer. The timer counts down until another command is received to reset the timer. Normally the timer does not expire because the module resets it before the two-minute timer expires. NOTE: Type STT03 is referred to in this instruction. The information also applies to Types STT02 and STT02E terminals. 

Differences are noted as they occur. In the event a module failure occurs, the transmitter timer expires after two minutes. The transmitter resets itself and receives configuration commands from other devices such as the smart transmitter terminal.

ABB PM861A Technical drawing:

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