Siemens SIMATIC S7-1500 System Manual page 264

Testing with a force table
The following functions are available in the force table:
● Monitoring of tags
Force tables are used to monitor the actual values of the individual tags of a CPU user
program or a CPU
- On the PG/PC
- On the Web server
You monitor the table with or without a trigger condition.
You monitor the following tags:
– Bit memory
– Contents of data blocks
– Peripheral inputs
● Modifying tags
You use this function to assign fixed values to individual tags in a user program or a CPU
on the PG/PC and Web server. Modifying is also possible with Test with program status.
The following tags are modifiable:
– Bit memory
– Contents of data blocks
– Peripheral inputs (e.g. %I0.0:P)
● Forcing of peripheral inputs and peripheral outputs
You can force individual peripheral inputs or peripheral outputs.
– Peripheral inputs: Forcing of peripheral inputs (for example %I0.0:P) is a "bypassing"
– Peripheral outputs: Forcing of peripheral outputs (for example %Q0.0:P) is a
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 ongoing
process for regulating purposes.
SIMATIC Drive Controller
System Manual, 11/2019, A5E46600094-AA
of sensors / inputs by the specification of fixed values to the program. The program
receives the force value instead of the actual input value (via process image or via
direct access).
"bypassing" of the complete program by the specification of fixed values to the
actuators.
Test and service functions
14.1 Test functions
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