Siemens Metro 21 M216KA, Руководство оператора

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13-9
ET 200L, ET 200L-SC and ET 200L-SC IM-SC Distributed I/O Device
EWA 4NEB 780 6009-02c
13.3.3 Digital Output
You can store a comparison value on the 1COUNT40kHz counter module.
This is assigned to the digital output. The output is activated depending on
the count and the comparison value. This section describes the various ways
of setting the responses of the output.
The digital output of the counter module is only available as a status bit. To
operate a digital output, you must read in this status bit, which is in the input
range, and output it to a digital output.
You transfer the comparison value to the 1COUNT40kHz counter module.
Counting is not affected by this.
The comparison value must lie within the count range of the counter module.
The comparison value is interpreted in accordance with the selected count
mode. If you specify a comparison value of FFFF
H
, for example, in 16-bit
mode the number is interpreted as 65535.
The output cannot be activated unless you first enable it by setting the ap-
propriate bit (see also Section 13.6, Subdivision of the Data Areas).
By default, the output is switched off.
The pulse duration can be set for the purpose of adaptation to the actuators
being used. The pulse duration specifies how long the output is to be set. The
pulse duration can be set between 0 and 3 s in steps of 100 ms.
If you set the digital output: logic parameter to inverted, in its active state the
digital output has a 0 in its status bit.
This does not take effect until the parameter values are received.
Introduction
Comparison Value
Enabling the
Output
Default Setting
Pulse Duration
Digital Output:
Logic
The 1COUNT40kHz Counter Module