KEYENCE SR-750 Series - Manual (Page 90)

90 E SR-750 UM
9-4
Reference Program
This section introduces simple reference programs regarding the PLC link with the
SR-750 Series.
In actual operation, program by taking into account error handling, etc.
Timing diagram
In the following timing diagram, an explanation of operation of devices and the SR-
750 Series in real time processing and sequential processing is given.
Construct an operation program by referring to the timing diagram.
„ Real time processing
• When starting the program, specify the alternate function or parameter bank
number to be used. (D+00 region)
• Read data is overwritten in the data region (D+02 and over). To transfer data, do
so at the timing for setting the flag (B+04) to OFF.
• Data from D+02 will be overwritten. As a result, if the length changes, since there
may remain previous data in the region, program to delete data from D+04, after
transferring data if necessary.
„ Sequential processing
• When starting the program, set the processing method (A+01) to sequential
processing, and specify the alternate function or parameter bank number to be
used in the D-00 region.
• When data write request (B+02) is ON and data write complete (B+03) is OFF,
program to set data write enabled (A+02) to ON.
This setting makes it possible to obtain all data even when multiple pieces of data
are sent.
• When data write complete (B+03) is set to ON, new data is written into D+02 and
over. Perform a data transfer at the timing for setting data write complete flag
(B+03) to ON.
• Data after D+02 will be overwritten. As a result, if the length changes, since
previous data may remain in the region, program to delete data from D+04, if
necessary, after transferring data.
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Reading success Reading error
Control region
Response
region
Read operation (The light is illuminated.)
Processing
method A+01
Timing instruction
A+00
Timing response
B+00
Data being written
B+04
Data region
Read bank
Instruction D+00
Data region
D+02~
Alternate instruction or the specified value of parameter bank
Read
data
Read
error
Reading OK Read error
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Reading success Reading error
Control region
Response
region
Read operation (The light is illuminated.)
Processing
method A+01
Timing instruction
A+00
Timing response
B+00
Data write
request B+02
Data region
Read bank
instruction D+00
Data region
D+02~
Alternate instruction or the specified value of parameter bank
Read
data
Read
error
Data write
complete B+03
Data write
enabled A+02
Reference Program
This is a reference program for the use of the KV Series. In this program, error
handling is not considered, thus program by taking into account error handling and
test in actual operation.
„ SR-750 Series configuration
It is assumed that the SR-750 Series is configured as follows:
• Timing : Level trigger
• Read mode : Single
• Memory assignment DM front address: DM1000
Control region address: R100
Response region address: R200
• PLC link timing input : Yes
* To use on a trial basis, specify the PLC communication interface to the SR-750
Series and perform communication configuration for the KV Series.
„ Real time processing
„ Sequential processing
Write "0" into DM1000 and set to use
the alternate function.
Input R000 as read timing.
Set up the R101 and set it to sequential
processing.
Write "0" into DM1000 and set to use
the alternate function.
Input R000 as read timing.
Use the data write request flag (R202),
data write enabled flag (R102), data
write complete flag (R203) to perform
sequential processing.
Specifying alternate function
CR2008
Timing input processing
R000 R100
Data processing
R204
Program data to be written into
DM1004 or later.
END
ENDH
#0
DW
DM1000
Specifying sequential processing and alternate function
CR2008 R101
SET
Timing input processing
R000 R100
Sequential processing
R202
Program read data to be written into
DM1004 or later.
END
ENDH
R102 R203
Data processing
R203
#0
DW
DM1000