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Siemens TX-I/O™ Module system – Functions and operation CM110561en_08
Building Technologies Digital output functions 2018-10-25
In the case of bus failure, with DC 24 V module supply available, the following backup
states van be parameterized:
– No (0%) (= default)
– Value (Backup value)
– Keep Same value as before the bus failure
Parameterization can be done during runtime.
The quality value "No_Output" will be sent in the following cases:
• TXM1.8T: AC 24 V missing. The triac is not able to switch
The module switches the output off and stops the stroke model.
The process value is set to the present position of the stroke model.
• Other modules: DC 24 V is insufficient. The module tries to switch the relays.
The fault message will only be sent when a command is pending.
Pressing the middle of one of the override buttons associated to the function
enables/disables local override.
When local override is active:
• Pressing "+" on one of the I/O points operates the OPEN relay, I/O point (n)
• Pressing "–" on one of the I/O points operates the CLOSE relay, I/O point (n+1)
• The I/O status LED remains ON while the override button is pressed
• The stroke algorithm is updated.
• Local operation can be disabled in the configuration.
• The I/O status LED is ON when the relay is active.
• In the case of an error the module status LED and the I/O status LEDs assigned to
the function flash.
For details, especially in relation to flashing pattern and errors: refer to the section "Dis-
play, operation and diagnostics" in the TX-I/O™ Engineering and installation guide [6].
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