1756-L61 WallClock time incorrect

dlsutherland

Member

D

Join Date

Oct 2009

Location

MO

Posts

1

• Oct 13, 2009

• #1

I have, on few occasions, had to correct the time in the CPU. Our power here will go out from time to time so the first thing I did was check the battery. The battery is good so any ideas or similar experiences as to why the cpu would not keep the correct time.

 

Brownhat

Member

B

Join Date

Mar 2007

Location

MN

Posts

139

• Oct 13, 2009

• #2

From the Rockwell Knowledgebase: Time of Day Clock Accuracy - Maximum variation at 20 degrees C is 3 min. 4 sec. per month. The other thing to consider is the setting for Daylight Saving Time.

 

widelto

Member

Join Date

Jul 2005

Location

Barranquilla, Colombia

Posts

3,392

• Oct 13, 2009

• #3

I have more than 20 plcs ( contrologix and compact logix) and i use logix5000 clock update tool, this way they are always in sync.

 

Oakley

Member

O

Join Date

Oct 2004

Posts

1,082

• Oct 13, 2009

• #4

I utilize a clock sync bit between a master controller and all the remote nodes. Currently I have 45 PLC's of various vintages. Of course, this was all put in place prior to the clock sync tool.