Software section
3.2 Creating the program
S7-1500
Getting Started, 05/2014, A5E03981761-AC
71
Activating the EN/ENO mechanism
Introduction
The EN/ENO mechanism in various instructions enables you to detect runtime errors and
avoid a program crash. Newly inserted ENO instructions are disabled by default. You can
then activate the ENO enable output. You can use this in a new network that has the fill level
of all paint storage tanks reset to the start value (1000) at the same time.
1. Open the Main[OB35] program block and insert the MOVE instruction into network 10.
2. Expand the instruction to a total of four outputs.
3. Insert a normally open contact before the MOVE instruction.
4. Insert a reset coil after the MOVE instruction.
5. Interconnect the inputs and outputs of the MOVE instruction.
6. Generate the instruction with the ENO shortcut menu.
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