Beckhoff KL3222, Documentation

Access from the user program

KL3222

36

Version: 2.3.0

5.4

Register description

The registers are used for parameterization of the Bus Terminals and are present once for each channel.
They can be read or written by means of 

register communication [

}

 38]

.

•

R0: A/D converter, raw value

Register R0 contains the raw value of the analog/digital converter. This is the unchanged analog value
prior to any scaling.

•

R1: A/D converter, raw value of the line

Register R1 contains the raw value of the line resistance bR1 – RL1 or bR2 – RL2.

•

R6: diagnostic register

The status byte SBn of Channel n is shown in the low byte of register R6.

•

R7: command register

The command register of KL3222 is currently not used.

•

R8: terminal designation

Register R8 contains the name of the terminal: KL3222: 0x0C9C (3222

dec

)

•

R9: firmware version

Register R9 contains the ASCII coding of the terminal's firmware version, e.g. 

0x3141 = '1A'.

 The

'0x31'

 corresponds here to the ASCII character 

'1'

, while the 

'0x41'

 represents the ASCII character 

'A'

.

This value cannot be changed.

•

R12: minimum data length of a channel

◦ Bits 0 to 6 of the high-order byte indicate the minimum number of output data in bits: 000.0000

bin 

=

0

dec

 so 0 bytes.

◦ Bits 0 to 6 of the low-order byte indicate the minimum number of input data in bits: 001.1000

bin

 =

24

dec

 so 3 bytes.

◦ The fact that bit 7 is set indicates that the control and status byte are not mandatory for the

terminal function and are not transferred in compact mode.

•

R16: hardware version number

Register R16 contains the hardware version of the terminal.

•

R17: manufacturer compensation - offset

This register contains the offset of the vendor calibration.

•

R18: manufacturer compensation - gain

This register contains the gain of the vendor calibration.

•

R19: manufacturer scaling - offset

This register contains the offset of the manufacturer scaling. It can be enabled by 

R32.1 [

}

 37]

 in the

feature register.

•

R20: manufacturer scaling - gain

This register contains the gain of the manufacturer scaling. It can be enabled by 

R32.1 [

}

 37]

 in the

feature register.

•

R23: reference calibration value: offset

This register contains the reference value of the calibration, which is determined during the vendor
calibration.

•

R24: reference calibration value: gain

This register contains the reference value of the calibration, which is determined during the vendor
calibration.

•

R31: code word register

◦ If you write values into the user registers without first entering the user code word (0x1235) into

the code word register, the terminal will not accept the supplied data.

◦ If you write values into the user registers and have previously entered the user code word

(0x1235) in the code word register, these values are stored in the RAM registers and in the
SEEPROM registers and are therefore retained if the terminal is restarted.

The code word is reset if the terminal is restarted.

•

Feature register (R32)

The feature register specifies the terminal's operation mode.