DVP-ES2/EX2/EC5/SS2/SA2/SX2/SE&TP Operation Manual - Programming
6.4 Low Voltage Handling Procedures
The low voltage means When the 24 Vdc power supply is lower than 17.8 V (error margin:
approximately 2%) and lasts for more than 10 ms.
Once low voltage detected, the PLC CPU performs the following handling process flow:
Error LED blinks fast
every 0.2 s econds
Low voltage detected
PLC checks the f ollowings:
• Record t he operation status and g o into low voltage state
• Stop all outputs (output status included)
• Stop all communications
• Stop refreshing t he states of all extension IO modules
• Save the d ata f rom the retained section
• Error LED blinks fast every 0.2 seconds
Is the e rror LED
blinking f ast?
M1019 = On
M1019 = Off (Default)
The 24 Vdc power
supply being stable
for more than 2 s ?
No
Yes
If “RU N”is the
state before low voltage
?detected
Yes
Stop -> Run
Back to n ormal
operation
• Turn of the e rror LED
• Activate the communication
• Restore refreshing t he state of all extension IO modules
• M1009 On D1009 1= & +
No
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