HollySys LK Series User Manual

Chapter 9 Fault and Treatment
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9.1.2 General Failures
1. Battery / Capacitance fault
This fault occurs if power in battery/capacitor is low or battery/Capacitor box is not plugged. You need
to replace the battery when BAT light in LK220 module is on.
You need to configure function block sysGetBatteryAlarm (Get Battery Alarm) to obtain the alarm
information. Function block refer to the manual HollySys Programmable Logic Controller PLC
Instruction Manual for details.
2. Power fault
It will not cause master-slave switching that the one power in LK921 is fault. This moment, the
one power light is off.
3. LK220 fault
 Ethernet fault
Single Ethernet fault will not cause master-slave switching. This moment, fault diagnosis
information is reported.
4. LK249 fault
 DP link fault
Single DP link fault only reports the diagnosis information, and will not turn off the indicators and
master-slave switching.
DP diagnosis information of slave station is not detected.
5. LK240 fault
 Redundancy fiber fault
This fault occurs if dual fiber are broken and fiber are cross connected. During this, the ERR light
on LK240 module is on, and fault diagnosis information is reported. The value of Error pin in the
function block sysGetRedState outputs error code at the same time.
When the single fiber is broken, the function block sysGetRedState reports the error code and the
ERR light on LK240 module is off.
 A/B switch conflict
It will trigger this fault that LK240 A, B Dail switch is consistent, and the controller is restarted. At
this time, the ERR indicator light on LK240 module is on, the two controllers are in a failed state
without running.
A/B switch conflict show the different phenomenon in following case.
 Slave restart
The ERR indicator on LK240 module which in master and slave frame are red.
This moment, the slave equipment state is fault.
Output parameter ExtDiag [0] in diagnosis function block sysGetComModleDiagInfo (Get
Diagnosis of Communication Module) is 1.
 Master and slave restart

Master-slave switching must be carried out in the opposite equipment without serious
fault.

HollySys LK Series Specifications

General

Brand	HollySys
Model	LK Series
Category	Controller
Language	English