06.03
8.4 Testing the PLC program
8-260
Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
8.4.3 Monitor/control using the SIMATIC Manager STEP7
The SIMATIC Manager STEP7 provides an extensive functionality for testing
the PLC program or the module.
The menu command Target System > Monitor/Control Variable is used to
start the tool “Monitor/control variable”.
“Monitor and control variable” can be used to:
S Display the current values of individual variables of the PLC user program or
the CPU module: Monitor variables.
S Assign individual variables of the PLC user program or the CPU module
fixed values: Control variables.
S Assign individual I/O outputs of the PLC user program or the CPU module
fixed values in the STOP operating status: Enable PO and activate control
values.
S Assign individual variables of the PLC user program or the CPU module
fixed values which cannot be overwritten by the PLC user program: Force
variables.
You can specify or display values of the following variable types:
S Inputs, outputs, flags, timers and counters
S Contents of data blocks
S I/O.
Summarize the variables you want to display or control in variable tables.
When and how often variables are monitored or overwritten with values, is de-
fined by Triggering Point and Trigger Condition.
The menu command Target System > ... provides the following further test
functions:
S Display accessible nodes
S CPU messages ...
S Display force values
S Diagnose hardware
S Module status ...
S Operating status ...
Monitoring and
controlling the
variable
Variable types
Further test
functions
8 PLC Start-U
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