Digital modules
8.7 SM 326; F-DO 10 x DC 24V/2A PP (6ES7326-2BF10-0AB0)
Fail-safe signal modules
170 Installation and Operating Manual, 01/2010, A5E00085586-10
Wiring scheme
Interconnect two
opposite outputs
with assigned redundancy to form a single output. The
parallel circuit in combination with an internal test coordination between the outputs 0 to 4
and 5 to 9 suppresses the "0" test pulse (dark period).
/
0
'2
'2
/
0
/
0
60
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Figure 8-59 Wiring two outputs in parallel for dark period suppression of the SM 326; F-DO 10 x DC
24V/2A PP
Note
Use the same reference potential for 2M and 3M.
Note
If you are using actuators that respond too fast (< 1 ms) to "dark period" test signals, you can
nonetheless use the internal test coordination by wiring two opposite outputs in parallel (with
assigned redundancy). Parallel wiring suppresses the dark periods.
Parameters Range of values Type Effective
range
"Parameters" tab
Mode of operation Safety mode static module
F_Monitoring_Time (ms) 10 ms to 10000 ms Static Module
Diagnostic interrupt Activated/deactivated Static Module
Fail-safe value
Switch to fail-safe value
Keep last valid value
Static Module
Maximum test period 100 / 1000 s Static Module
Load voltage failure diagnostics Activated/deactivated Static Channel
group
Activated Activated/deactivated Static channel
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