IAI America ACON-CY - Manual (Page 80)

68
5. Operation Using I/O Signals
Operation timings
PLC processing 1: The rear end move command signal (ST0) and front end move command signal (ST1)
turn OFF, and the intermediate point move command signal (ST2) turns ON.
Operation: [1] The actuator starts moving, and when it reaches the intermediate point, the
intermediate point positioning complete output (PE2) turns ON. The zone output
signal also turns ON.
PLC processing 2: The intermediate point move command signal (ST2) turns OFF and the sequence
processing is performed.
Once the sequence processing is completed, the front end move command signal
(ST1) turns ON.
[2] When the actuator starts moving toward the front end, the intermediate point
positioning complete output (PE2) turns OFF.
When the actuator moves 50 mm thereafter, the front end positioning complete
output (PE1) turns ON.
PLC processing 3: The front end move command signal (ST1) turns OFF, and the sequence processing is
performed.
Once the sequence processing is completed, the front end move command signal
(ST1) turns ON.
[3] When the actuator starts moving toward the front end, the front end positioning
complete output (PE1) turns OFF.
When the actuator moves 50 mm thereafter, the front end positioning complete
output (PE1) turns ON again.
* The same steps are repeated for the number of loads.
The PLC should be programmed so that if the zone output signal is OFF when the signal ON/OFF state is
checked upon completion of positioning, the PLC will recognize that the applicable load is the last load.
If the PLC count and the zone output signal state do not match, the signal timings may not be
synchronized.
Caution: Note on checking positioning complete signals
When a move command signal turns ON, the relevant positioning complete output signal turns
OFF temporarily. To determine if positioning has completed, therefore, check the leading edge of
the positioning complete output signal after it has turned OFF.
Intermediate point move
command input (ST2)
Front end move command
input (ST1)
Intermediate point positioning
complete output (PE2)
Front end positioning
complete output (PE1)
Zone output (ZONE)
[1] [2] [3]
Speed
PLC
processing
PLC
processing
PLC
processing
Time Intermediate
point