Mitsubishi QJ71BR11 User Manual

6 - 4 6 - 4
MELSEC-Q
6 PROGRAMMING
6.1.2 Program example
Interlocks should be applied to the programs according to the link status of the host
and other stations.
The following example shows an interlock in the communication program that uses the
link status of the host (SB47, SB49) and the link status of station number 2 (bit 1 of
SW70 and bit 1 of SW74).
(Example)
SB47: Host baton pass status
SB49: Host data link status
SB20: Network module status
SW70: Other station baton pass status
SW74: Data link status of each station
SW78: Other station parameter
communication status
Communication program with remote I/O station No. 2
Set the values shown below for timer constant K .
Baton pass status
(T0, T2)
(Sequence scan time
4) or more
Cyclic transmission status
Parameter communication status
(T1, T3, T4)
(Sequence scan time
3) or more
Reason: This is to prevent occasional errors due to cable conditions or electrical noise
from stopping control.
Also, the multipliers of 4 and 3 should only be considered as a guideline.

Mitsubishi QJ71BR11 Specifications

General

Model	QJ71BR11
Communication Protocol	MELSECNET/H
Number of Ports	1
Transmission Speed	10 Mbps
Number of Occupied Slots	1
Maximum Number of Connectable Stations	64
Weight	0.2 kg
Type	Communication Module
Compatibility	MELSEC-Q series PLC
Power Supply	5V DC
Station Type	Remote I/O

Summary

Safety Precautions

Design Precautions

Precautions related to system design and potential hazards.

Installation Precautions

Guidelines for safe and correct installation of the product.

Wiring Precautions

Safety measures and best practices for wiring connections.

Setup and Procedures Before Starting the Operation

Standalone Check of the Network Module (Offline Tests)

Network Diagnostics from GX Developer (Online Test)

Parameter Settings

Remote Master Station Parameter Setting

Remote I/O Station Parameter Settings

Programming

Troubleshooting

Network Diagnostics (Network Monitor)

Troubleshooting

General troubleshooting procedures for the system.

Error Codes

Lists and explains various error codes.

Items to be checked first

Initial checks to perform when troubleshooting.