Keyence SV Series User Manual

A-39
A-5MECHATROLINK-II Communication Commands
APPENDIX
- SV Series User’s Manual -
■Phases
MECHATROLINK communication is divided into 3 phases.
■Terminology
Transmission period . . . . . . . Communication period in MAC (Media Access Control Layer). Represents physical
communication period for sending data in transmission path.
Communication period. . . . . . Communication period of application layer. Please set it with integer multiples of
transmission period.
Type
Sync type. . . . . . . . . . . . . Command type for command/response sending/receiving in each communication
period.
The response for sending command will be received in the next communication period.
Update and check of WDT (Watchdog Timer) value in the frame are performed in each
communication period.
Async type. . . . . . . . . . . . Command type for command/response sending/receiving which is async with
communication period.
The response for sending command is not necessary to wait until next communication
period.
The WDT (Watchdog timer) value in the frame is not checked.
Communication mode
Sync communication. . . . Communication mode for command/response sending/receiving in each communication
period.
Async communication. . . Communication mode which is async with communication period and is driven by an
event to send commands. But the sending/receiving for command/response is sync with
communication period.
Phases Status
Phase 1 The power is turned on and ready for connection.
Phase 2 Connection is established and ready for async communication.
Phase 3 Connection is established and ready for sync communication.

Keyence SV Series Specifications

General

Display	LCD
Output Type	Digital, Analog
Power Supply	24V DC
Communication	Ethernet, RS-232, RS-485
Series	SV Series
Programming Language	Ladder Logic
Mounting	Panel mounting
Operating Temperature	0 to +50°C
Storage Temperature	-20 to +60°C
Vibration Resistance	10 to 55 Hz
Shock Resistance	30G