Siemens CPU 312C Hardware And Installation Guide

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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
9-19
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You have two options for monitoring variables:
• updating the status values once via menu item 9DULDEOH!8SGDWHVWDWXV
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or
• continuous update of status values via menu item 9DULDEOH!0RQLWRU
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To control variables, proceed as follows:
1. Left-click the field &RQWUROYDOXH of the relevant variable.
2. Enter the control value according to the data type.
3. To update control values once, select the menu item 9DULDEOH!(QDEOH
FRQWUROYDOXHV.
or
Enable control values permanently via menu item 9DULDEOH!&RQWURO.
4. In the 0RQLWRU test function, verify the control value entry in the variable.
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You can disable the control value entered in the table. An invalid value is displayed
same as a comment. You can re-enable the control value.
Only valid control values can be enabled.
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• The "Trigger point for monitoring" determines the time of update for values of
variables to be monitored.
• The "Trigger point for controlling" determines the time for assigning the control
values to the variables to be controlled.

Siemens CPU 312C Specifications

General

Brand	Siemens
Model	CPU 312C
Category	Processor
Language	English