Материал: m012900e

102 • I/O modules

Digital Inputs 750-402, -403

Modular I/O System

ETHERNET TCP/IP

I/O modules • 103

Counter modules 750-404, /000-XXX

4.2.1.1.3 Counter modules 750-404/000-XXX Up Down Counter100kHz 750-404

I/O modules and variations

Technical description

Attention

The description that is in the I/O ring binder data pages (888-530/013-600 dated 7/96) is not correct. The bottom contacts are additional outputs.

The described configuration is counter with up/down input.

The following description is preliminary and is applicable to the factory configuration.

The counter module can operate with all WAGO-I/O-SYSTEM bus-couplers (except for the economy type).

Modular I/O System

ETHERNET TCP/IP

104 • I/O modules

Counter modules 750-404, /000-XXX

Modular I/O System

ETHERNET TCP/IP

I/O modules • 105

Counter modules 750-404, /000-XXX

Organization of the input and output data:

The counter begins processing with pulses at the CLOCK input. The changes from 0 V to 24 V are counted. (The leading edge of each pulse.)

The counter counts up, if the input U/D is set at 24 V. With an open circuit input or 0 V the counter counts backwards (down).

The two bottom contacts are 24V outputs. These outputs are activated through bits in the control byte.

The high states of the input and output channels are each indicated by a LED.

Attention

For the process data configuration of these bus modules please refer to chapter "Process data architecture for MODBUS/TCP" in the process image description of the corresponding coupler/controller.

The control byte has the following bits::

The status byte has the following bits:

With the control and status byte the following tasks are possible:

Setting the counter:

Set Bit 5 in the control byte to "1". The desired counter value with the 32 bit value is loaded into output bytes 0-3. As long as the bits are set, the counter can stop and information is stored. The ensuing data of the counter will be conveyed to the status byte.

Blocking the counter:

Bit 4 is set into the control byte, then the count process is suppressed. Bit 4 in the status byte communicates the suppression of the counter.

Setting the outputs:

Bits 2 and 3 set the additional two outputs of the counter module.

The result of the counter is in binary. The following tasks can be handled with the control byte and the status byte:

Modular I/O System

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106 • I/O modules

Counter modules 750-404, /000-XXX

An example:

Setting counter to a value of 100 and counting up

First of all the counter reading is set to 100 by "Setting counter", i. e. to the hexadecimal value: 0x64.

1.Enter the counter reading in the output data.

The data bytes D0 to D3 of the output data then read as follows:

2.Validate the counter reading in the control byte with bit 5 (setting counter) to have it adopted as an output value. The control byte has the following bits:

3.Wait for the feedback from the counter module in the status byte, bit 5 (counter set). The status byte has the following bits:

4.Set bit 5 (setting counter) in the control byte in order to finish the Handshake. The bits in the control byte read as follows:

5.The set counter reading then appears in the input data with the following data bytes D0 to D3:

Counter counting up:

Attention

For counting up, 24 V must be applied to input U/D.

6.Wait for the first and further count pulses.

During counting, the data bytes D0 to D3 of the input data appear as follows:

Attention

"X" is used if the value at this position is without any significance.

Modular I/O System

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