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Digital modules
4.8 Digital input module SM 421; DI 16 x DC 24 V (6ES7421-7BH01-0AB0)
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
117
4.8.3 Behavior of the SM 421; DI 16 x DC 24 V
Effect of operating mode and supply voltage on the input values
The input values of the SM 421; DI 16 x 24 DC depend on the operating mode of the CPU
and on the supply voltage of the module.
Table 4- 9 Relationships of the analog input values on the CPU's operating state and on the L+
supply voltage
CPU operating state Power supply L+ at digital module Input value of digital module
L+ present Process value RUN
L+ missing 0 signal*
L+ present Process value
POWER ON
STOP
L+ missing 0 signal*
L+ present - POWER OFF -
L+ missing -
* Depends on the parameter assignment
Reaction to failure of the supply voltage
Failure of the supply voltage of the SM 421; DI 16 x 24 DC 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.
Short-circuit at the sensor supply Vs
The relevant Vs LED goes dark if a short-circuit is detected at the sensor supply Vs,
irrespective of parameter settings.
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