Mitsubishi QJ71E71-100 Series, Руководство пользователя

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MELSEC-Q
4 WHEN THE QCPU ACCESSES THE OTHER STATION PLC USING THE
DATA LINK INSTRUCTION
(Example) IP address when the command is sent (for class B)
H
Bit location 31
30 29 16 to 15 0
Host address Network address
FFFF
H
to
Class
For the external devices on the Ethernet, perform read-dump processing locally
for the received commands not related to the local station.
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
H
(229))
These processing are performed automatically with the Ethernet module.
(4) Interlock when executing the data link instruction
(a) Via Ethernet
Exe
cute the data link command when the local station (communication
request source station) Ethernet module is at the following I/O sign
al state.
X19 X1F
SEND
X19: Initial normal complation signal
X1F: Watchdog time error station signal
(b) Via MELSECNET/H, MELSECNET/10
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 MELSECNET/H, MELSECNET/10 Reference Manual for the
interlock signals, link data send/receive processing, and processing time
when performing data communication with the other station PLC CPU via
MELSECNET/H, MELSECNET/10.
(5) Number of resend designation of data link instruction
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.