SMC Networks LECSB Series, Руководство по эксплуатации

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14 - 10
14. ABSOLUTE POSITION DETECTION SYSTEM
14.8.2 Transfer method
The sequence in which the base circuit is turned ON (servo-on) when it is in the OFF state due to the servo-on
(SON) going OFF, an emergency stop (EMG), or alarm (ALM), is explained below. In the absolute position
detection system, every time the servo-on (SON) is turned on, the ABS transfer mode (ABSM) should always
be turned on to read the current position in the driver to the PC or PLC...etc. The driver transmits to the PC or
PLC...etc the current position latched when the ABS transfer mode (ABSM) switches from OFF to ON. At the
same time, this data is set as a position command value inside the driver. Unless the ABS transfer mode
(ABSM) is turned ON, the base circuit cannot be turned ON.
(1) At power-on
(a) Timing chart
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
95[ms] 95[ms]
1)
2), 3)
Power
supply
Servo-on
(SON)
4)
ABS transfer mode
(ABSM)
ABS request
(ABSR)
ABS transmission
data ready
(ABST)
Transmission
(ABS) data
Base circuit
Ready
(RD)
If SON is turned ON before ABSM is input
During transfer of ABS During transfer of ABS
(Note) (Note)
(Note) (Note)
(Note) (Note)
ABS data ABS data
Operation
enabled
Operation
enabled
ABSB0:bit1
ABSB1:bit2
Note. For details, refer to (1) (b) of this section.
(Pin 17)
(Pin 18)
(Pin 25)
(Pin 22)
(Pin 23)