P4: PLC for SINUMERIK 828D
14.4 Test and diagnostic functions
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
1145
14.4.3.8 Working with test functions in the status chart
You access the test functions (Single read, Write all,) using the menu "Test" or using the function bar with the test
functions.
Single read
Use single read if you require a "snapshot", i.e. a single update of the program status of all values.
As default, the chart status continually interrogates the target system for status updates. If you click on a
status chart and the chart status is disabled, then the button for single read is activated.
Write all
After you have entered the values in the column "New value" in the status chart, write the required changes
to the target system using the command "Write all".
14.4.4 Execute cycles
You can specify that the target system should process a certain number of cycles of your program (from 1 cycle
up to 65535 cycles). If you specify that the target system should execute a certain number of cycles, then you
can monitor the processing of the process variables.
In the first cycle, the value of SM0.1 = 1 (ON).
Executing a single cycle
1. The target system must be in STOP operating state. If it is not already in STOP, switch the target system into
the STOP operating state.
2. Select the menu command "Test" > "First cycle".
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