Test and service functions
13.1 Test functions
Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ
261
Testing with watch tables
The following functions are available in the watch table:
● Monitoring of tags
With watch tables, you can monitor the current values of individual tags of a user program
or a CPU on the PG/PC and Web server. For the Web server to be able to display the
value of tags, you must specify a symbolic name for each tag in the "Name" column of the
watch table.
You can 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
Use this function to assign fixed values to the individual tags of a user program or CPU.
Modifying is also possible for testing with program status.
You can control the following operand areas:
– 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 "Control immediately"
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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