YASKAWA S-7 Series Command Manual page 161

 Latch Status
Latch completion can be confirmed by the following status.
[SVCMD_STAT]
L_CMP2: L_CMP2 is set to "1" for one communication cycle every time the external signal is
input.
[EX_STATUS] EX_STATUS is allocated to OMN1 (Pn824) or OMN2 (Pn825).
(Pn824 = 84h or Pn825 = 84h)
L_SEQ_NO (D8-D11):The latch sequence signal number (≤ n) on completion of latching of the
current position
(Added on completion of position latching)
L_CMP_CNT (D0-D7): The continuous latch count (≤ m)
(Added on completion of position latching when the latch sequence sig-
nal n is input.)
 Latched Position Data
The latest latched position data at completion of latching can be obtained by using the follow-
ing monitor.
Name
Feedback Latch Position
The previously latched position data can be obtained by using the following optional monitors.
Name
Optional Monitor 1
Optional Monitor 2
 Operation Example
An example of a continuous latch operation using two latch sequence signals EXT1 and EXT2
is illustrated below.
(The parameters are set as follows: Pn850 = 2, Pn851 = 2 or more, Pn852 = 0021h, Pn853 =
any)
LT_REQ2 = 1
Communication
cycle
L_CMP2
(STATUS)
LPOS2
(Monitor)
L_CMP_CNT
0
(EX_STATUS)
L_SEQ_NO
0
(EX_STATUS)
EXT1 input signal
EXT2 input signal
Time from LT_REQ2 = 1
reception to latch
operation start: 250 μs
Code
LPOS2 The latest latch signal input position
Code
Pn824 = 81h:
OMN1
Previous latch (sequence) signal 2 input position (LPOS2)
Pn825 = 81h:
OMN2
Previous latch (sequence) signal 2 input position (LPOS2)
1
1 2
Interval between
latch signals: 500 μs min.
6.6 Latch Function
6.6.1 Continuous Latch by LT_REQ2 Bit
Remark
Remark
LT_REQ2 = 0
2
1 2
0
0
6
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