Beckhoff KL2521-0000 Manuel d'utilisateur télécharger pdf (Page 17)

Access from the user program

KL2521 15

Control and Status Byte

Control Byte in process data exchange

The Control Byte is sent to the terminal from the controller. It can be used

in register mode (REG = 1) or 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 Function

7 Reg_Access

0: Register communication inactive (process data exchange)

5 Cnt_Clr

The contents of the counter is cleared or set (Feature.10) by this

bit. Any overflow or underflow bits that might be set are also

cleared by this bit. The process can be edge triggered or level

triggered (Feature.4).

2 Go_Counter

If travel distance control is active (Feature.9), then a pre-set

counter value is approached when the bit is set

1 Ramp_DisS

Operation of the ramp function is cancelled, in spite of Feature.5

being active; if travel distance control is active, it is interrupted by

this bit

0 Freq_Sel

Rapid change of the base frequency

(only if the ramp function is inactive)

0: Base frequency 1 (registers 36 / 37)

1: Base frequency 2 (registers 38 / 39)

Status Byte in process data exchange

The Status Byte is sent from the module to the controller.

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 Function

7 Reg_Access

0: acknowledge for process data exchange

6 Error

General error bit, included with overflow/underflow

5 Input_Z

End position reached

4 Input_T

The actual value when the device is connected does not agree

with the set value of the connected device.

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 immediately an underflow occurs.

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 immediately an overflow occurs.

1 Ramp_Active

Ramp is currently being followed

0 Sel_Ack/

End_Counter

Confirms the change of base frequency.

At activated travel distance control:

target counter value reached

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

1 2 ... 12 13 14 15 16 17 18

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Beckhoff KL2521-0000 Manuel d'utilisateur Page 17

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