Siemens SIMATIC S7-1200 System Manual page 1334

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15.13 Monitoring and modifying values in the CPU

The clearing of the I memory area is not

affected by the Force function.

The initialization of the outputs values is

not affected by the Force function.

During the execution of the startup OBs,

the CPU applies the force value when

the user program accesses the physical

The storing of interrupt events into the

queue is not affected.

The enabling of the writing to the out-

puts is not affected.

While writing Q memory to the physical out-

puts, the CPU applies the force value as the

outputs are updated.

When reading the physical inputs, the CPU

applies the force values just prior to copying

the inputs into I memory.

During the execution of the user program

(program cycle OBs), the CPU applies the

force value when the user program accesses

the physical input or writes the physical out-

Handling of communication requests and self-

test diagnostics are not affected by the Force

The processing of interrupts during any part of

the scan cycle is not affected.

S7-1200 Programmable controller

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