Siemens SIMATIC S7-1500 System Manual page 476

Testing with a force table
The following functions are available in the force table:
• Monitoring of tags
You use watch tables to monitor the actual values of the individual tags of a CPU user
program.
– On the PG/PC
– On the display of the CPU
You can monitor the table with or without trigger conditions.
Please note the following requirement for displaying the tag values on the CPU display:
You must specify a symbolic name for each tag in the "Name" column of the force table.
You monitor the following tags:
– Bit memory
– Contents of data blocks
– Peripheral inputs
• Forcing of peripheral inputs and peripheral outputs
You can force individual peripheral inputs or peripheral outputs.
– Peripheral inputs: Forcing peripheral inputs "bypasses" sensors/inputs by specifying
– Peripheral outputs: Forcing peripheral outputs "bypasses" the complete program by
The advantage of the force table is that you can simulate different test environments and
overwrite tags in the CPU with a fixed value. This enables you to intervene in the running
process in a regulating way.
Testing with a PLC tag table
You can monitor the current data values of tags in the CPU directly in the PLC tag table. To do
so, open the PLC tag table and start the monitoring.
You may also copy PLC tags to a watch table or force table and monitor, modify or force them
there.
Testing with a data block editor
The data block editor offers different options for monitoring and modifying tags. These
functions directly access the actual values of the tags in the online program. Actual values are
the current values of tags in the CPU work memory at any given moment during program
execution. The following functions for monitoring and modifying are available in the
database editor.
• Monitor tags online
• Modify individual actual values
• Create a snapshot of the actual values
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
fixed values for the program. Instead of the actual input value via a process image or
direct access, the program receives the force value.
specifying fixed values for the actuators.
Test and service functions
15.1 Test functions
475