Access from the user program
KL304x, KL305x 39Version: 4.0
5.5 Control and status byte
The control and status byte is transmitted from the controller to the terminal. It can be used
• in register mode [}40] (REG = 1
bin
) or
• in process data exchange [}39] (REG = 0
bin
).
5.5.1 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 [}36] 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 0
bin
Bit 6 1
bin
: Terminal compensation function is enabled
Bit 5 reserved
Bit 4 1
bin
: Gain calibration
Bit 3 1
bin
: Offset calibration
Bit 2 0
bin
: slower cycle = 1000ms
1
bin
: fast cycle = 50ms
Bit 1 1
bin
: up
Bit 0 1
bin
: 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 0
bin
Bit 6 1
bin
: Error (general error bit)
Bit 5 Bit 4
0
bin
0
bin
Limit value 2 not enabled
0
bin
1
bin
Process data < limit value 2
1
bin
0
bin
Process data > limit value 2
1
bin
1
bin
Process data = limit value 2
Bit 3 Bit 2
0
bin
0
bin
Limit value 1 not enabled
0
bin
1
bin
Process data < limit value 1
1
bin
0
bin
Process data > limit value 1
1
bin
1
bin
Process data = limit value 1
Bit 1 1
bin
: Overrange
Bit 0 1
bin
: Underrange
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