Operating Instructions

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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].
Fault message
(series D and higher)
Local override
Display