Enabling Outputs In Stop Mode - Siemens SIMATIC S7-1200 System Manual

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Enabling outputs in STOP mode

The watch table allows you to write to the outputs when the CPU is in STOP mode. This

functionality allows you to check the wiring of the outputs and verify that the wire connected

to an output pin initiates a high or low signal to the terminal of the process device to which it

is connected.

Risks in writing to physical outputs in STOP mode

Even though the CPU is in STOP mode, enabling a physical output can activate the

process point to which it is connected, possibly resulting in unexpected equipment

operation. Unexpected equipment operation can cause death or severe personal injury.

Before writing to an output from the watch table, ensure that changing the physical output

cannot cause unexpected equipment operation. Always observe safety precautions for your

process equipment.

You can change the state of the outputs in STOP mode when the outputs are enabled. If the

outputs are disabled, you cannot modify the outputs in STOP mode. To enable the

modification in STOP mode of the outputs from the watch table, follow these steps:

1. Select the "Expanded mode" menu command from the "Online" menu.

2. Select the "Enable peripheral outputs" option of the "Modify" command of the "Online"

menu, or from the context menu after right-clicking the row of the Watch table.

You cannot enable outputs in STOP mode if you have configured distributed I/O. An error is

returned when you try to do this.

Setting the CPU to RUN mode disables "Enable peripheral outputs" option.

If any inputs or outputs are forced, the CPU is not allowed to enable outputs while in STOP

mode. The force function must first be cancelled.

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

15.13 Monitoring and modifying values in the CPU

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