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12.4 Troubleshooting by Symptom
Troubleshooting methods are described by symptom. Perform these troubleshooting if the following communications
cannot be established even though no error is detected in the master/local module.
• Safety communication
• Cyclic transmission
• Transient transmission
If an error has occurred in the master/local module, identify the error cause using GX Developer.
( Page 235, Section 12.2)
12.4.1 Safety communication cannot be established
The following lists the actions to be taken if safety communication cannot be established.
If the above actions do not solve the problem, perform the following tests on the master/local module to check for
hardware error.
• Hardware test ( Page 60, Section 6.2.1)
• Self-loopback test ( Page 62, Section 6.2.2)
Check item Action
In Network Configuration Setting of the master station, is the
safety station specified as a reserved station?
Cancel the reserved station setting. ( Page 81, Section 7.3)
Do the station numbers set in Network Configuration Setting of
the master station match those set for corresponding safety
stations?
Correct station number (s).
Is safety connection set among safety stations that perform
safety communication?
Set safety connection among safety stations that perform safety
communication in "Safety Communication Setting". ( Page 90,
Section 7.6)
Is the same "Open Method" set to safety stations that perform
safety communication?
Set one of the safety stations "Active" and the other "Passive".
( Page 90, Section 7.6)
Is the transmission interval monitoring time value valid?
Correct the transmission interval monitoring time value.
( Page 308, Appendix 5.4)
Is the safety refresh monitoring time value valid?
Correct the safety refresh monitoring time value. ( Page 309,
Appendix 5.5)
Does safety station interlock status (SM1700, SD1700 to
SD1707) indicate interlock status?
Release the interlock using safety station interlock release request
(SM1720, SD1720 to SD1727). ( Page 100, Section 8.1.3)
Is a standard station set in "Communication Target Station No."
in “Safety Communication Setting"?
Set a safety station for "Communication Target Station No.".
( Page 90, Section 7.6)
Is "Safety Data Transfer Device Setting" correctly set?
Correct "Safety Data Transfer Device Setting" set for the safety stations
that perform safety communication. ( Page 90, Section 7.6)
Is any transfer target device in "Safety Data Transfer Device
Setting" overlapped with any refresh target device of another
network module?
Correct "Safety Data Transfer Device Setting" or the refresh parameters.
Overlap of a transfer target device can be checked in the "Assignment
Image" window through a programming tool supported by the
programmable controller used. ( Page 88, Section 7.5 (2))