Siemens SIMATIC S7-1500 System Manual page 263

Test and service functions
14.1 Test functions
Testing with watch tables
The following functions are available in the watch table:
● Monitoring of tags
With watch tables, you monitor the current values of individual tags in a user program or
a CPU on the PG/PC and Web server. Please note the following requirement for
displaying the tag values on the Web server: You must specify a symbolic name for the
tag in the "Name" column of the watch table.
You monitor the following operand areas:
– Inputs and outputs (process image) and bit memory
– Contents of data blocks
– Peripheral inputs and peripheral outputs
– Timers and counters
● Modifying tags
You use this function to assign fixed values to individual tags in a user program or a CPU
on the PG/PC. Modifying is also possible with Test with program status.
The following operand areas are modifiable:
– Inputs and outputs (process image) and bit memory
– Contents of data blocks
– Peripheral inputs and peripheral outputs (for example, %I0.0:P, %Q0.0:P)
– Timers and counters
● "Enable peripheral outputs" and "Modify now"
These two functions enable you to assign fixed values to individual peripheral outputs of
a CPU in the STOP mode. You can also use them to check your wiring.
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SIMATIC Drive Controller
System Manual, 11/2019, A5E46600094-AA