Omron FH series User Manual page 165

You write the following control
commands for the Vision Sensor.
• Control signals
• Command code
• Command parameters
Command/
response method
The Vision Sensor writes the
execution results to the PLC.
The Vision Sensor writes the output
data to the PLC.
Data output
after
measurements
*1: You can use output controls (handshaking) to prevent output data from being externally output from the communications buffer
until the Controller (master) turns ON the DSA signal to request the output data.
*2: The following processing items are used to read characters:
Character Inspection, Barcode, 2DCode, and OCR
*3: Reference: Settings Required for Data Output (p.29) for information on the Output Units that output measurement data.
Note
The PLC Link protocol communicates using three link areas: Command Area, Response Area, and Data Output Area. It is
different from the serial PLC Link protocol used to inter-connect OMRON PLCs serially.
IMPORTANT
In the default settings for PLC Link communications, the data output processing method is set to the same processing used
for models prior to the FZ4.
This setting synchronizes the measurement processing and data output processing so that all data output processing
finishes when measurement finishes. However, this makes the overall processing time for the measurement flow longer.
If required for your application, change the communications settings to Asynchronous Output Mode, which performs
measurement processing and data output processing in parallel. Reference:
Vision System FH/FZ5 Series User's Manual
for Communications Settings (Z342)
PLC (master)
1. Command Area
2. Response Area
3. Data Output Area
Sensor Controller (slave)
Commands
The control commands that are
written to the Command Area are
executed.
Executi o n
Measurement results are written
Responses
to the Response Area of the PLC.
• Status signals
• Command code
• Response code
• Response data
• Measurement Flow
Read characters
Execution of
are written to the
processing item (1)
Output Area.
External
Data is written to the
Communications
*1
outputs
Module.
Execution of processing
Communi-
*2
item to read character data
cations
Module
Execution of processing
item *3
The Vision Sensor writes the values
measured by processing item (1).
Asynchronous Output (p.182)
...
Responds when a
command is received.
...
Operations are
performed by
executing the
measurement flow.
for the Output Unit.
Communicating with PLC Link
2
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