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3
SPECIFICATIONS
3.3 Function List
3 - 10
1
OVERVIEW
2
SYSTEM
CONFIGURATION
3
SPECIFICATIONS
4
FUNCTIONS
5
PREPARATORY
PROCEDURES BEFORE
OPERATION
6
LINK DATA SEND/
RECEIVE PROCESSING
AND PROCESSING TIME
7
PROGRAMMING
8
TROUBLESHOOTING
3.3 Function List
This section describes a function list of a local module.
POINT
(1) Access to another station from peripheral or intelligent function module
Access to another station is not allowed for any peripheral (GX Developer,
GOT, etc.) and intelligent function module (e.g. serial communication module)
connected to a Q series local station.
Also, any peripheral and special function module connected to the master
station cannot access any Q series local station.
Section 4.2 Transient Transmission Function
Table 3.8 Function list
Function Description
Reference
section
Cyclic transmission
1: n communication
(B/W
communication)
Data is communicated between the master station and a local station and between
local stations.
Note that Q series local stations refresh link data using the sequence program.
Section
4.1.1
1:1 communication
(X/Y
communication)
The 1:1 data communication is performed between the master station and a local
station.
Note that Q series local stations refresh link data using the sequence program.
Section
4.1.2
Transient
transmission
LRDP/LWTP
instruction
By executing the LRDP/LWTP instruction in the sequence program of the master
station, data can be read from or written to local station devices (T, C, D, W).
Note that Q series local stations handle the reception of the LRDP/LWTP
instruction with the sequence program.
Section 4.2
RAS function
Automatic return
When a local station disconnected due to a data link error is recovered, the station
automatically returns to the network and restarts data link.
Section
4.3.1
Loopback
Disconnects a faulty part such as a disconnected cable or a faulty station from the
network to continue data link among normally operating stations. (Not provided for
the MELSECNET/B data link system)
Section
4.3.2
Error detection
Refreshes a special relay (for link) and special register (for link) of a local module
to a device of the CPU.
The data link status or faulty part can be checked by using the refreshed device.
Note that the network diagnostics of GX Developer is not available for Q series
local stations. Check the data link status or a faulty part in the above-mentioned
way.
Section
4.3.3
Self-diagnostics Checks the hardware or cable wiring of a local module. Section 5.5