Yaskawa MP900 Series Machine Controller for Standard Operation - Manual (Page 234)

3.7 MP940 Module Definitions
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Transmission Protocol
• MEMOBUS: Yaskawa's standard MEMOBUS protocol.
• MELSEC: Mitsubishi's special protocol (control protocol type 1) for use with general-
purpose sequencers and computer links.
• OMRON: OMRON's SYSMAC C-series Host Link protocol.
• No protocol: Data can be transferred at any time by the user application program.
Serial I/F
Select CIR#01 for RS-232C and CIR#2 for RS-485/422.
Transmission Mode
• RTU: Specify RTU mode for MEMOBUS protocols.
• ASCII: Specify ASCII mode for MEMOBUS protocols.
• None: Specify MELSEC, OMRON, or no protocol.
Sending (Send Delay)
When Enable is selected, a delay until the beginning of transmissions (1 to 100 ms) can be
set.
• Master Station:
The delay will be included between execution of the MSG-SND function and the trans-
mission of the command.
• Slave Station:
The delay will be included between reception of a command by the MSG-RCV function
and the transmission of the response.
Automatically Reception (Automatic Reception)
Specify the ranges of relays, registers, and coils to check when automatically sending a
response message to a query from the master. These settings are valid for slave stations only.
There is no need to set the ranges when message transmissions will not be performed
between the master and slaves. Also, if the ladder program is being used to return a response
message with the MSG-RCV function, disable the automatic response so that redundant pro-
cessing is not performed.
With the system default settings, response messages will be sent using the ranges set with
the following parameters.
Write-in width of Coil/
Hold Register Set the range of the coils and holding registers that can be written for
automatic response.
Setting Item Details