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6 SEQUENCE PROGRAM USED FOR POSITIONING CONTROL
(2) Starting by inputting external start signal
When starting positioning control by inputting the external start signal, the start
command can be directly input into the D75P2. This allows the variation time
equivalent to one scan time of the PLC CPU to be eliminated. This is an effective
procedure when operation is to be started as quickly as possible with the start
command or when the starting variation time is to be suppressed. To start
positioning control by inputting the external start signal, set the "data required to
be set" and then turn ON the external start signal.
Restrictions
When starting by inputting the external start signal, the start complete signal
[RXn1, RXn2] will not turn ON.
Data required to be set
To execute positioning start with the external start signal, set parameter (
Pr.43 )
beforehand, and validate the "external start signal" with the "external start function
valid setting program (program No. 6).
Setting item
Setting
value
Setting details
Remote input/output,
buffer memory address
Axis 1 Axis 2
Pr.43
External start
function selection
0 Set to "0: External positioning start". 62 212
External start valid ON Set to "ON: Validate external start". RY(n+2)B RY(n+4)B
* Refer to section "3.4 Specifications of input/output signals for master module", "Chapter 5 DATA USED FOR
POSITIONING CONTROL" for details on the setting details.
Starting time chart
Pr. 43 External start function selection
0
V
t
1(00)
External start si
g
nal
1
External start valid
Dwell time
Operation pattern
Positionin
g
start si
g
nal
Remote station READY
si
g
nal
D75P2 READY signal
Start complete si
g
nal
BUSY si
g
nal
Error detection si
g
nal
Positioning start No.
Positionin
g
complete si
g
nal
Positioning data No.
[RY(n+1)0]
[RX(n+7)B]
[RXn0]
[
RXn
1]
[
RXn4]
[
RXn7]
[
RXn
A]
[RWwm, RWwm+8]
[RY(n+2)B, RY(n+4)B]
Fig. 6.11 Time chart for starting with external start signal