Process data exchange

Control byte in process data exchange (REG=0)

A gain and offset calibration of the terminal can be carried out with the control byte. The code word must be entered in R31 so that the terminal calibration can be carried out. The gain and offset of the terminal can then be calibrated. The parameter will only be saved permanently once the code word is reset!

Bit

Description

Bit 7

0bin

Bit 6

1bin: Terminal compensation function is enabled

Bit 5

reserved

Bit 4

1bin: Gain calibration

Bit 3

1bin: Offset calibration

Bit 2

0bin: slower cycle = 1000 ms

1bin: fast cycle = 50 ms

Bit 1

1bin: up

Bit 0

1bin: down

Status byte in process data exchange (REG=0)

The status byte is transferred from the terminal to the controller. The status byte contains various status bits for the analog input channel:

Bit

Description

Bit 7

0bin

Bit 6

1bin: Error (general error bit)

Bit 5

Bit 4

 

0bin

0bin

Limit value 2 not enabled

0bin

1bin

Process data < limit value 2

1bin

0bin

Process data > limit value 2

1bin

1bin

Process data = limit value 2

 

Bit 3

Bit 2

 

0bin

0bin

Limit value 1 not enabled

0bin

1bin

Process data < limit value 1

1bin

0bin

Process data > limit value 1

1bin

1bin

Process data = limit value 1

Bit 1

1bin: Overrange

Bit 0

1bin: Underrange