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Siemens Simatic S7-400 User Manual

Page 149

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Digital Modules

4-27

S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07

4.9.1

Assigning Parameters to the SM 421; DI 16

24 VDC

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; DI 16

24 VDC

You will find an overview of the parameters you can set and their default settings
for the SM 421; DI 16

24 VDC in the table below.

Table 4-10 Parameters of the SM 421; DI 16

24 VDC

Parameter

Value Range

Default

2)

Parameter

Type

Scope

Enable

Diagnostic interrupt

1)

Hardware interrupt

1)

Yes/no
Yes/no

No
No

Dynamic

Module

Destination CPU for
interrupt

1 to 4

Static

Module

Diagnostics

Wire break

No load voltage
L+/sensor supply

Yes/no
Yes/no

No
No

Static

Channel
Channel
group

Trigger for hardware
interrupt

Dynamic

Channel

Rising edge

Falling edge

Yes/no

Yes/no

Dynamic

Channel

Input delay

3 ms (DC)
0.1 ms (DC)
0.5 ms (DC/AC)

3 (DC)

Static

Channel
group

Reaction to Error

Substitute a Value (SV)
Keep Last Value (KLV)

SV

Dynamic

Module

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.

Assignment of the Encoder Supplies to Channel Groups

The two encoder supplies of the module are used to supply two channel groups:
inputs 0 to 7 and inputs 8 to 15. In these two channel groups, you parameterize the
diagnostics for the encoder supply, too.

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