Delta Electronics Programmable Logic Controller DVP-PLC - Manual (Page 487)

9 Application Instructions API 150-199
DVP-PLC Application Manual 9-15
transmit the data to D1337 and D1336 of CH0 or D1339 and D1338 of CH1. In addition, the absolute position
data should be written into the present value registers (D1348, D1349) of CH0 pulse (Y10) or the present value
registers (D1350, D1351) of CH1 pulse (Y11) in SC series MPU; therefore, we suggest you designate the two
corresponding registers. If you designate other devices as the registers, you still have to transmit the data to
D1348 and D1349 of CH0 or D1350 and D1351 of CH1.
9. When DABSR instruction starts to read, after finishing reading the absolute position of SERVO, flag M1029 will
be On. The user has to reset the flag.
10. When driving the DABSR command, please specify normally open contact. If the drive contact of DABSR
command turns Off when DABSR command read starts, the execution of absolute current value read will be
interrupted and result in incorrect data. Please be careful and notice that.
Program Example:
1. When X7 = On, the 32-bit absolute position data read from Servo will be stored in the present value registers
(D1337, D1336) of CH0 pulse in EH MPU. At the same time, the timer T10 is enabled and starts to count for 5
seconds. If the reading of the absolute position is not completed after 5 seconds, M10 will be On, indicating that
the reading of absolute position encounters abnormality.
2. When enabling the connection to the system, please synchronize the power input of DVP-PLC EH/EH2/SV and
SERVO AMP or activate the power of SERVO AMP earlier than DVP-PLC.
X7
DABS X0 Y4 D1336
TMR T0 K50
M11
M10
T0
SET M11
M1029
ABS read completed
execution completed
flag
Read overtime
ABS absolute position
data read is abnormal
ABS absolute position
data read completed
Time-out : 5 sec.
Remarks:
1. If the instruction is interrupted when PLC is still reading the absolute position of SERVO, an ALARM message
(ALE5) will occur in SERVO.
2. Timing chart of DABSR instruction reading absolute position:
a) When DABSR instruction starts to execute, it will drive SERBVO On (SON) and ABS transmittion mode for
output.
b) By “transmission is ready” and “ABS request” signals, you can confirm the transmission and reciept of both
sides as well as processing the transmission of the 32-bit present position data plus the 6-bit check data.
c) The data are transmitted by ABS (bit0, bit1).