Материал: m013800e

The PLC is able to control transmission and reception of data by means of the control byte and the status byte.

Initialization of the module:

·set IR in the control byte

·transmit/receive functions are blocked

·output/input buffers are erased

·serial interface module will load its configuration data

Transmitting data:

·TR¹TA: put characters into output byte 0 to 2

·amount of characters is specified in OL0 to OL2

·TR is inverted and read out

·characters are put into output buffer if TR=TA

Receiving data:

·RR¹RA: in input byte 0 to 2 characters are available

·amount of characters is specified in IL0 to IL2

·charactersin IL0 to IL2 are read out

·RA is inverted and read out

·all characters are read when RR=RA

The transmitting and receiving of data can be done simultaneously. The initialization request has prioirity and will stop transmitting and receiving of data immediately.

Message: input buffer full (Bit 3)

Input buffer is full. Data which are received now are lost.

:$*2Ç, 2Ç6<67(0

Examples:

The module is initialized.

- The initialization bit in the control byte is set.

- After the initialization has been executed, the status byte will give back 000.0100.

Sending of the data string “Hello”:

- The first 3 characters and the buffer length of 3 are transmitted.

- The transmission request bit (TR) is inverted.

- As soon as TR=TA, the rest of the data can be sent.

- The last 2 characters and the buffer length of 2 are transmitted.

- The transmission request bit (TR) is inverted.

:$*2Ç, 2Ç6<67(0

- As soon as TA = TR, the data has been transferred to the output buffer.

Receiving the character chain “WAGO”

- As soon as RA¹RR, the input bytes contain data.

- After the 3 characters have been processed, RA is inverted.

- If RA¹RR, the receiving of additional characters will continue.

- After the characters have been processed, RA is inverted.

Notes:

0 x 23 is a hexadecimal value

0101.1001 is a binary value

An X indicates that this particular value has no importance. XX indicates that the whole value has no importance.

Status Indicators:

The 3 green LEDs have the following function:

:$*2Ç, 2Ç6<67(0

Structure of the in and output data for ModBus

The module is a combined input and output module with 2 x 16 bit input and output data.

The RS232 module is also available with a data format of 5 bytes (item-no. 750- 650/000-001).

:$*2Ç, 2Ç6<67(0

Data exchange module

PN 750-654

Technical Description

This technical description is only valid for hardware and software versionx X X X X 2 C 0 0 - - - -. The product series number is printed on the right side of the module.

The operational mode described below is for the factory preset mode.

The following description is preliminary and is applicable to the factory configuration. Many other operational modes are possible (please contact WAGO for the corresponding settings.)

Attention:

Some modules do not provide all power jumper contacts (e.g. 4-channel)! A module which needs all contacts (e.g. 2-channel digital) cannot be connected to the right hand side of modules which do not have 3 power jumper contacts.

The data exchange module is able to run with all :$*2Ç, 2Ç6<67(0 buscouplers (except for the economy type).

:$*2Ç, 2Ç6<67(0