Test functions and fault resolution
10.1 Test functions
S7-1500 Automation System
System Manual, 01/2013, A5E03461182-01
131
Testing with the force table
The following functions are available in the force table.
● Monitoring of tags
This allows the current values of the individual tags of a user program or a CPU to be
displayed on the programming device or PC. Tags can be monitored with or without a
trigger frequency.
The following tags can be monitored:
– 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"
of sensors / inputs by the specification of fixed values to the program. Instead of the
actual input value (via process image or via direct access) the program receives the
force value.
– Peripheral outputs: Forcing of peripheral outputs (for example %Q0.0:P) is a
"bypassing" of the complete program by the specification of fixed values to the
actuators.
Difference between controlling and forcing
The fundamental difference between the controlling and forcing functions consists in the
storage behavior:
● Controlling: Controlling of variables is an online function and is not stored in the CPU.
You can end controlling of variables in the watch table or by disconnecting the online
connection.
● Forcing: A force job is written to the SIMATIC memory card and is retained after a
POWER OFF. An active force job is indicated in the display of the S7-1500 CPU through
a corresponding icon. You can only end the forcing of peripheral inputs and peripheral
outputs in the force table.
Testing with the LED flash test
In many online dialogs, you can perform an LED flash test. This function is useful, for
example, when you are not sure which device in the hardware configuration corresponds to
the station currently selected in the software.
When you click the "Flash LED" button, an LED flashes at the currently selected station. On
the CPU, the following LEDs flash: RUN/STOP LED, ERROR LED and MAINT LED. The
LEDs continue to flash until you terminate the flash test.
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