
Digital modules
4.10 Digital input module SM 421; DI 16 x UC 24/60 V (6ES7421-7DH00-0AB0)
S7-400 Automation System Module Data
128 Reference Manual, Edition 09/2009, A5E00850736-06
4.10.2 Assigning parameters to the SM 421; DI 16 x UC 24/60 V
Parameter assignment
You will find a description of the general configuration of digital modules in section 5.3.
Parameters of the SM 421; DI 16 x UC 24/60 V
The following table contains an overview of the parameters you can set and their default
settings for the SM 421; DI 16 x UC 24/60 V.
Table 4- 11 Parameters of the SM 421; DI 16 x UC 24/60 V
Parameters Value range Default
2
Parameter type Scope
Enable
Diagnostic interrupt
1
Yes/no No
Hardware interrupt
1
Yes/no No
Dynamic Module
Destination CPU for interrupt
1 to 4 - Static Module
Diagnostics
Wire break
Yes/no No Static Channel
Hardware interrupt trigger
Positive edge
Negative edge
yes/no
yes/no
- Dynamic Channel
Input delay
3
0.5 ms (DC)
3 ms (DC)
20 ms (DC/AC)
3 ms (DC) Static Channel group
1
If you use the module in ER-1/ER-2, you must set this parameter to "No" because the interrupt lines are not available in
ER-1/ER-2.
2
Only in the CR (central rack) is it possible to start up the digital modules with the default settings.
3
If you assign 0.5 ms , then you should not configure diagnostics because the internal processing time for diagnostic
functions can be > 0.5 ms.
Ensuring a wire break check is carried out
To ensure that a wire break check is carried out, you require an external sensor circuit using
a resistor of 18 to 56 kΩ. The resistor should be connected parallel to the contact and should
be arranged as closely as possible to the sensor.
This additional resistor is not required in the following cases:
● If 2-wire BEROs are used
● If you do no configure the "Wire Break" diagnostics
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