Siemens S7-400PLC Dokumentacja Strona 160

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Digital modules
4.17 Digital output module SM 422; DO 32 x DC 24 V/0.5 A (6ES7422-7BL00-0AB0)
S7-400 Automation System Module Data
160 Reference Manual, Edition 09/2009, A5E00850736-06
4.17.3 Behavior of the SM 422; DO 32 x DC 24 V/0.5 A
Influence of the operating state and supply voltage on output values
The output values of the SM 422; DO 32 x DC 24 V/0.5 A depend on the operating mode of
the CPU and on the supply voltage of the module.
Table 4- 14 Relationships of the analog output values on the CPU's operating state and on the L+
supply voltage
CPU operating mode Power supply L+ at digital module Output value of digital module
L+ present CPU value RUN
L+ missing 0 signal
L+ present Substitution value/last value
(default = 0 signal)
POWER ON
STOP
L+ missing 0 signal
L+ present 0 signal POWER OFF -
L+ missing 0 signal
Reaction to failure of the supply voltage
The failure of the supply voltage of the SM 422; DO 32 x DC 24 V/0.5 A is always indicated
by the EXTF LED on the module. This information is also available on the module (entry in
diagnostic data.)
Diagnostics interrupt triggering is based on parameter settings.
See also
Assigning parameters to the SM 422; DO 32 x DC 24 V/0.5 A (Page 159)
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