KL2521-0000, KL2521-0024 - Process data exchange

Control byte in process data exchange (REG=0)

Bit

7

6

5

4

3

2

1

0

Name

Reg_Access

0

Cnt_Clr

0

0

Go_Counter

Ramp_Dis

Freq_Sel

Bit

Name

Description

Bit 7

Reg_Access

0bin: Register communication inactive (process data exchange)

Bit 5

Cnt_Clr

The counter value is cleared or set by this bit (Feature.10). Any overflow/underflow bits that have been set are also cleared by this bit. This can be done with edge control or level control (Feature.4).

Bit 2

Go_Counter

If travel distance control is active (Feature.9), then a pre-set counter value is approached when the bit is set.

Bit 1

Ramp_Dis

The ramp function is disabled despite active Feature .5;
if the travel distance control is active it is aborted by this bit.

Bit 0

Freq_Sel

Fast toggling of the base frequency (only if ramp function is deactivated)
0: Base frequency 1 (registers 36 / 37)
1: Base frequency 2 (registers 38 / 39)

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

7

6

5

4

3

2

1

0

Name

Reg_Access

Error

Input_Z

Input_T

Overflow

Underflow

Ramp_Active

Sel_Ack/
End_Counter

Bit

Name

Description

Bit 7

Reg_Access

0bin: Acknowledgement for process data exchange

Bit 6

Error

General error bit, included with overflow/underflow

Bit 5

Input_Z

End position reached

Bit 4

Input_T

The actual value when the device is connected does not agree with the set value of the connected device.

Bit 3

Overflow

This bit is set if the 16-bit counter overflows (65535 -> 0). It is reset when the counter exceeds one third of its measuring range (21845 -> 21846) or as soon as an underflow occurs.

Bit 2

Underflow

This bit is set if the 16-bit counter underflows (0 -> 65535). It is reset when the counter drops below two thirds of its measuring range (43690 -> 43689) or as soon as an overflow occurs.

Bit 1

Ramp_Active

Ramp is currently being followed

Bit 0

Sel_Ack/
End_Counter

Confirms the change of base frequency.
If travel distance control is activated:
target counter value reached

The change of the base frequency requires a reset for activation.