Siemens TX-I/O TXM1.8X-ML - Page 41

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Siemens TX-I/O™ Module system – Functions and operation CM110561en_08
Building Technologies Digital output functions 2018-10-25
• The multistate process value is mapped so that the mapping table defines just one
output to be driven by a pulse.
Despite the interlocking of the contacts inside the module, overlapping "ON" states
can occur (due to delayed release of the contactors, or "sticky" contacts) when
switching from one stage to another. For this reason the contactors must always be
interlocked externally (refer also to the connection diagram in the module data sheet)
• In the Mapping Table parameter, the default assignment of the I/O points to the
values of MOValue can be changed (only for 1 to n mapping !).
• If no value corresponding to the process value is found in the mapping table, a
Reliability Error message is transmitted (Quality = MULTISTATE_FAULT) and a
configurable back-up value is enabled (parameter Backup Value).
MOValue
Stage
Pulse on I/O point
0
0
n
1
1
First n, then n + 1
2
2
First n, then n + 2
3
3
First n, then n + 3
4
4
First n, then n + 4
5
5
First n, then n + 5
In the case of bus failure, with DC 24 V module supply available, the following backup
states van be parameterized:
– No (Inactive) (= default)
– Value (Active, Inactive)
– Keep Same value as before the bus failure
Parameterization can be done during runtime.
• The I/O status LED is ON when the relay is active.
• In the case of an error the module status LED and all the I/O status LEDs assigned
to the function flash.
Pressing the middle of one of the override buttons assigned to the function
enables/disables local override. When local override is active:
• Pressing "+" on one of the I/O points switches the load up one stage.
Repeated or sustained pressure can be used to switch several stages until the
function reaches the highest stage.
• Pressing "–" on one of the I/O points switches the load down one stage.
Repeated or sustained pressure can be used to switch several stages until the
function stops at the lowest stage.
• The change from one stage to the next occurs only after a delay of 0.3 s.
This makes it possible to reach a stage directly (e.g. jump from stage 2 to stage 0
and then to stage 3).
• The Override LED of all I/O points assigned to the function go off briefly while the
switch is pressed.
• The I/O status LEDs indicate the activity of the relays
• Local operation can be disabled in the configuration.
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].
Parameterization
Display
Local operation