Automation Module ABB SPS01

I/O modules maintain the last values until they have recognized the interrupted connection with the CPU module; they then adopt the configured safety values. Safety values are maintained until the CPU module has executed a warm start and sends new values to the I/O modules.

A signal for connection monitoring is permanently exchanged between I/O modules and the CPU module of the process station. If this signal does not appear for more than 250 ms (for 500 kbit/s) and/or 1,25 s (for 100 kbit/s ) both sides detect the interruption of the connection. The CPU module sends a system message to the operator station and the output modules adopt the safety values. Dependent on the requests of the process the safety values can configure as "Hold the last value" or to a particular value/state.

I/O modules maintain the last values until they have recognized the connection interruption and then adopt safety values until the CPU module sends actual values after the restart. In the case of power fail of the I/O module, output levels adopt zero voltage and/or zero current. After voltage return, I/O modules only change their output level when the CPU module communicates actual values. Analog output modules are an exception. They hold the last values as long as the external voltage supply does not fail. Outputs are only de-energized when the CPU module is powered again.

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