KEYENCE SR-750 Series - Manual (Page 100)

100 E SR-750 UM
Level trigger operation procedure
This section describes the example when the trigger input measurement method of
the SR-750 Series is set to the level trigger.
„ Timing chart
The attributes (signal directions) are described using the following directions.
*1 Operations of OUT1 status and OUT2 status are described using the default
settings of the SR-750 Series operation and multi I/O.
*2 The read data ready count value and read data update count value may differ
depending on the operation status and communication frequency.
For example, when a code is read and then the next reading is complete before
updating the PLC data is complete, the result data load count value will have
one more count value.
„ When reading is successful
1
When "Read Request" of PLC turns OFF (0) →ON (1), the SR-750
Series starts reading operation and turns "TRG BUSY" ON (1).
2
The SR-750 Series operates as follows when reading a code.
• It turns "TRG BUSY" OFF(0) and "Read Complete" ON (1), and then writes
the reading error cause to "Reading Result".
• It writes the output data and number of characters of output data to "Read
Data" and "Read Data Size".
* When reading is successful, the reading error cause is "0" (No error).
3
When "Read Complete" of the SR-750 Series is ON (1), turn "Read
Complete Clear" of PLC ON (1).
4
When "Read Complete Clear" of PLC turns ON (1), the SR-750 Series
turns "Read Complete" OFF (0). When "Read Complete" OFF (0) is
confirmed, turn "Read Complete Clear" of PLC OFF (0).
„ When reading fails
1
When "Read Request" of PLC turns OFF (0) →ON (1), the SR-750
Series starts reading operation and turns "TRG BUSY" ON (1).
2
When "Read Request" of PLC turns OFF (0) before the SR-750 Series
read the code, the SR-750 Series operates as follows.
• It turns "TRG BUSY" OFF (0) and "Read Complete" and "Reading Error" ON
(1), and then writes the "Reading Error Cause".
• It writes the output data and number of characters of output data to "Read
Data" and "Read Data Size".
* When reading error occurs, "201" is written to "Reading Error Cause".
3
When "Read Complete" of the SR-750 Series is ON (1), turn "Read
Complete Clear" of PLC ON (1).
4
When "Read Complete Clear" of PLC turns ON (1), the SR-750 Series
turns "Read Complete" and "Reading Error" OFF (0).
When "Read Complete" OFF (0) is confirmed, turn "Read Complete
Clear" of PLC OFF (0).
NOTICE
When [Read Request] is turned ON/OFF at high speed while the
EtherNet/IP cyclic cycle (RPI) is slow, the change of rising/falling
of [Read Request] may not be transmitted to the SR-750 Series.
m+1 m
m+1 m
m+1 m
m+1 m
Output
→
Iutput
← : PLC ←SR-750
: PLC →SR-750
Attribute
Output
→
Iutput
←
Iutput
←
Output
→
Iutput
←
Iutput
←
Iutput
←
Iutput
←
Iutput
←
Iutput
←
Iutput
←
Signal name
Read Request
TRG BUSY
Barcode/2D code
Read Complete
Read Complete
Read Complete Clear
Reading Error
Reading Error Cause
OUT1 Status (OK) *1
OUT2 Status (ERROR NG) *1
Read Data Ready Count *2
Read Data Update Count *2
Read Data and Data Size
When reading successful
0 201
Read data ERROR
When reading fails
One-shot trigger operation procedure
This section describes the example when the trigger input measurement method of
the SR-750 Series is set to the one-shot trigger.
„ Timing chart
*1 Operations of OUT1 status and OUT2 status are described using the default
settings of the SR-750 Series operation and multi I/O.
*2 The read data ready count value and read data update count value may differ
depending on the operation status and communication frequency.
For example, when a code is read and then the next reading is complete before
updating the PLC data is complete, the result data ready count value will have
one more count value.
„ When reading is successful
1
When "Read Request" of PLC turns OFF (0) →ON (1), the SR-750
Series starts reading operation and turns "TRG BUSY" ON (1).
2
The SR-750 Series operates as follows when reading a code within
the specified one-shot time.
• It turns "TRG BUSY" OFF(0) and "Read Complete" ON (1), and then writes
the read operation result code to "Read Result Code".
• It writes the output data and number of characters of output data to "Result
Data" and "Result Data Size".
* When reading is successful, the reading error cause is "0" (No error).
3
When "Read Complete" of the SR-750 Series is ON (1), turn "Read
Complete Clear" of PLC ON (1).
4
When "Read Complete Clear" of PLC turns ON (1), the SR-750 Series
turns "Read Complete" OFF (0).
When "Read Complete" OFF (0) is confirmed, turn "Read Complete
Clear" of PLC OFF (0).
„ When reading fails
1
When "Read Request" of PLC turns OFF (0) →ON (1), the SR-750
Series starts reading operation and turns "TRG BUSY" ON (1).
2
When the one-shot time elapses before the SR-750 Series read the
code, the SR-750 Series operates as follows.
• It turns "TRG BUSY" OFF (0) and "Read Complete" and "Reading Error" ON
(1), and then writes the "Reading Error Cause".
• It writes the output data and number of characters of output data to "Read
Data" and "Read Data Size".
* When reading error occurs, "201" is written to "Reading Error Cause".
3
When "Read Complete" of the SR-750 Series is ON (1), turn "Read
Complete Clear" of PLC ON (1).
4
When "Read Complete Clear" of PLC turns ON (1), the SR-750 Series
turns "Read Complete" and "Reading Error" OFF (0).
When "Read Complete" OFF (0) is confirmed, turn "Read Complete
Clear" of PLC OFF (0).
m+1 m
m+1 m
m+1 m
m+1 m
Attribute
Output
→
Iutput
←
Iutput
←
Output
→
Iutput
←
Iutput
←
Iutput
←
Iutput
←
Iutput
←
Iutput
←
Iutput
←
Signal name
Read Request
TRG BUSY
Barcode/2D code
Read Complete
Read Complete
Read Complete Clear
Reading Error
Reading Error Cause
OUT1 Status (OK) *1
OUT2 Status (ERROR NG) *1
Read Data Ready Count *2
Read Data Update Count *2
Read Data and Data Size
When reading successful
0
One-shot trigger
duration
201
Read data ERROR
When reading fails
One-shot trigger
duration