Siemens Simatic S7-1500 Manual - Page 33

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The following figure shows an example of the behavior of the STS_DQ bit between the low

counting limit and comparison value.

Figure 4-12

Counting limits

The counting limits define the range of values of the counted value used. The counting limits

can be set in the parameters and can be changed with the user program during runtime.

Configurable high counting limit: 4294967295 (2

Low counting limit (not settable): 0

You can continue or terminate (automatic gate stop) counting if a counting limit is exceeded,

see the parameter "Behavior when a counting limit is exceeded".

Start value/load value

The start value is specified in the parameter assignment with STEP 7 (TIA Portal). The load

value can be changed by the user program. Both values must be between the low counting

limit and high counting limit.

Comparison values

You specify a comparison value per channel that can control the feedback bit STS_DQ

regardless of the user program. When the current counted value corresponds to the

comparison condition set in the parameters, the feedback bit STS_DQ is set. You can use

the feedback bit STS_DQ to control a digital output of a digital output module.

The comparison values can be set in the parameters and can be changed during runtime via

the user program with parameter data record 0/1.

Gate control

The opening and closing of the software gate (SW-GATE) defines the time window in which

the count signals are acquired. The software gate is controlled by the user program.

Reference

You can find additional information on the counting functionality in the function manual S7-

1500, ET 200MP, ET 200SP counting, measuring and position detection

(http://support.automation.siemens.com/WW/view/en/59709820).

DI 32x24VDC HF digital input module (6ES7521-1BL00-0AB0)

Manual, 09/2016, A5E03485935-AF

Behavior of the STS_DQ bit and hardware interrupt

Parameters/address space

-1).

4.2 Address space