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(4) Position Table Start (PT Start) Input signal
The position table supports the machine so that its motion can be controlled by I/O signals
of central controller. It can directly transmit commands such as position table number,
start/stop and origin return to the machine through the PLC. Also, the user can check output
signals such as in-position, completion of origin return and Servo ready through the PLC.
「
Position Table A0~A6
」
inputs are total 7 bits of input signal. It is used to set 128
position table numbers.
By using PT A0~A6 signals, the position table address can be set from 0 to 127 with a
binary number. A0 is least significant bit and A6 is most significant bit. The following
table shows how to assign position table number.
* If ‘PT A0~A6’ signal is not connected when motioning by ‘PT Start’ signal, the
position table number will be ‘0’
A7
A6
A5 ~ A3
A2
A1
A0
PT NO.
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
1
0
2
0
0
0
0
1
1
3
0
0
0
1
0
0
4
0
1
1
1
1
0
126
0
1
1
1
1
1
127
* PT-A7 must be set to ‘0’
(5) ‘Position Table Start (PT Start)’Input
By using PT A0~A6 signals, it can be set the PT start number to be executed.
Following example shows that total 6 motion patterns are executed sequentially starting
from No.0 and motion is terminated after execution of No.32.
①
All of PT A0~A7 is set to ‘0’ and PT number is set to ‘0’.
②
Set PT Start signal to [ON], and PT No.0 motion pattern will be executed.
③
When the motion pattern is started by PT, ACK signal and END signal are displayed
to [ON] at output port as illustrated below. The signal is kept until one motion pattern
loop is stopped. After all motions are stopped, the output signal level is set to [OFF].
④
PT Start is edge triggered input and pulse duration must be is 10ms or more.
