Siemens Simatic M7-400 - Parameters of the SM 421; DI

Digital Modules
4-69
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
4.18.1 Assigning Parameters to the SM 422; DO 16 20-125 VDC/1.5 A
Parameter Assignment
You will find a description of the general procedure for assigning parameters to
digital modules in Section 5.7.
Parameters of the SM 421; DO 16 20-125 VDC/1.5 A
You will find an overview of the parameters you can set and their default settings
for the SM 422; DO 16 20-125 VDC/1.5 A in the following table.
Table 4-17 Parameters of the SM 422; DO 16 20-125 VDC/1.5 A
Parameter
Value Range Default
2)
Parameter
Type
Scope
Enable
• Diagnostic interrupt
1)
Yes/no No Dynamic Module
• Destination CPU for
interrupt
1 to 4
–
Static Module
Reaction to CPU-STOP Substitute a value (SV)
Keep last value (KLV)
SV Dynamic Module
Diagnostics
• No load voltage L+
• Short circuit to M
Yes/no
Yes/no
No
No
Static
Channel
group
Channel
Enable substitute value
“1”
Yes/no No Dynamic Channel
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 CC (central controller) is it possible to start up the digital modules with the default settings.
Assigning the “No Load Voltage L+” Diagnosis to Channel Groups
You can only set the “No Load Voltage L+” diagnosis separately for each channel
group. In other words, the setting for channel 0 applies to inputs 0 to 7, and the
setting for channel 8 applies to inputs 8 to 15.