Test and service functions
10.1 Test functions
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
108 Operating Instructions, 11/2019, A5E35873416-AC
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 of a user program or
a CPU on the PG/PC and Web server. Note the following requirement to have the Web
server display the tag values: 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
With this function, you assign fixed values to the individual tags of 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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