Mitsubishi Electric Melsec Q Series User Manual page 97

4 WHEN THE Q/LCPU ACCESSES THE PROGRAMMABLE CONTROLLER
OF ANOTHER STATION USING THE DATA LINK INSTRUCTION
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(Example) IP address when the command is sent (for class B)
Bit location 31 30 29
Class
Read-dump the received commands not related to the local station on the
external device.
The COM.ERR.LED indicator of an Ethernet module may turn on and an error
code may be stored in the following buffer memory area when a response to a
simultaneous broadcast from the Ethernet module is returned from an
external device.
Error code/end code area (address: from E5
These processing are performed automatically with the Ethernet module.
(4) Interlock when executing the data link instruction
(a) Via Ethernet
cute the data link command when the local station (communication
Exe
request source station) Ethernet module is at the following I/O sign
X19 X1F
(b) Via other networks
Check the status of the local station (communication request source station),
communication relay station, and access destination (communication
request destination station) using the following devices. Execute the data
link instruction if the status is normal.
• Link special relay: SB20, SB47, SB70, etc.
• Link special register: SW70 to 73, SW74 to 77, etc.
See the reference manual for each network for the interlock signals, link
data send/receive processing, and processing time when performing data
communication with the programmable controller CPU of another station
via other networks.
(5) Specifying the number of times to resend the data link instructions
When executing each data link instruction except for ZNRD and ZNWR, it is
recommended to designate a value greater than "1" for the number of resend
designation area of the control data storage device.
The resend timing when the READ command is executed after designating the
number of resend is described below.
to 16 15
H
Network address
SEND
MELSEC-Q/L
to 0
FFFF
H
Host address
(229))
H
al state.
X19: Initial normal complation signal
X1F: Watchdog time error station signal
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