KL2521-0010 - Process data exchange
Control byte in process data exchange (REG=0)
Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Name | Reg_Access | 0 | SET_Z | SET_T | Cnt_Clr | Go_Counter | Ramp_Dis | Freq_Sel |
Bit | Name | Description |
|---|---|---|
Bit 7 | Reg_Access | 0bin: Register communication inactive (process data exchange) |
Bit 5 | SET_Z | Set output Z |
Bit 4 | SET_T | Set output T |
Bit 3 | Cnt_Clr | The counter value and eventually set overflow/underflow bits will be deleted 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; |
Bit 0 | Freq_Sel | Fast toggling of the base frequency (only if ramp function is deactivated) |
The change of the base frequency requires a reset for activation.
Status byte in process data exchange (REG=0)
The status byte is transferred from the terminal to the controller.
Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Name | Reg_Access | Error | Out_Z_ACK | Out_T_ACK | Overflow | Underflow | Ramp_Active | Sel_Ack |
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 | Out_Z_ACK | Output Z |
Bit 4 | Out_T_ACK | Output T |
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 | Confirms the change of base frequency. |