Siemens M7-400 ユーザーズマニュアル

4-47

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

 

You will find a description of the general procedure for assigning parameters to
digital modules in Section 4.3.

  

The following table contains an overview of the parameters you can set and their
default settings for the SM 421; DI 16 

 

 24/60 VUC.

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

 

 24/60 VUC

Enable

•

Diagnostic interrupt

•

Hardware interrupt

Yes/no
Yes/no

No
No

Dynamic

Module

•

Destination CPU for interrupt

1 to 4

–

Static

Module

Diagnostics

•

Wire break

Yes/no

No

Static

Channel

Trigger for hardware interrupt

•

Rising (positive) edge

•

Falling (negative) edge

Yes/no

Yes/no

–

Dynamic

Channel

Input delay

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

3 (DC)

Static

Channel group

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.

Only in the CC (central controller) is it possible to start up the digital modules with the default settings.

If you assign 0.5 ms , then you should not parameterize a diagnosis because the internal processing time
for diagnostic functions can be > 0.5 ms.

To ensure that a wire break check is carried out, you require an external sensor
circuit using a resistor of 18 to 56 k

 

 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 two-wire BEROs are used

•

If you don’t parameterize the “Wire Break” diagnosis