User Manual

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Siemens TX-I/O Engineering and installation guide CM110562en_13
Building Technologies Display, operation, and diagnostics 2019-05-15
– Voltage outputs: the AC/DC supply for field devices is low or not available;
therefore reliable operation of external devices cannot be guaranteed)
– Digital outputs (relays): the internal module operating power is low or not available;
therefore reliable operation of the relay cannot be guaranteed
– Voltage input signal types: the AC/DC supply for field devices is low or not available
– Current inputs: the DC 24 V field supply is low.
– Only during startup (before the module is polled or for max 4 s startup time):
After this, the ASIC is configured and working.
– The I/O function does not operate (e.g. directly after startup if the ASIC does not
provide any values)
1) Insecure Output Signal
2) Insecure General
3) I/O Point inactive
4) Invalid Process Value