Name: Siemens SIMATIC S7-300 Module data
Brand: Siemens
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Special Signal modules

5-13

Programmable Logic Controllers S7-300 Module Data

A5E00105505-03

Ending the freeze function

The freeze function must be ended at every encoder input. You acknowledge the

function in the user program by setting the bit 0, 1 or 2 depending on the channel

with the STEP 7-Operation T PAB “xyz” (for a program example, see chapter

5.4.9).

After exiting, bit 31 of the corresponding encoder value is again deleted and the

encoder values are again updated. A renewed freezing of the encoder values is

again possible as soon as you have deleted the acknowledgment bit in the output

address of the module.

In synchronous operation the acknowledgment is processed at time T

. From this

point in time a renewed freezing of the encoder values can take place via the

digital inputs.

Note

The freeze function is automatically acknowledged if you newly parameterize the

corresponding channel with different parameters (see 5.4.8 chapter).

If the parameters remain identical, the freeze function remains unaffected.

5.4.8 SM 338; POS-INPUT Parameterization

You parameterize the SM 338; POS-INPUT with STEP 7. You must perform

parameter assignment in STOP mode of the CPU.

As soon as you have set all the parameters, download the parameters from the

programming device to the CPU. On a transition from STOP to ³ RUN mode, the

CPU then transfers the parameters to the SM 338.

The parameters cannot be changed by the user program.

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