Retentive Memory in S7-200 Series

Ken J

Member

K

Join Date

Feb 2005

Location

Mentor, Ohio

Posts

82

• Jul 19, 2005

• #1

When power is lost and returned I find that some of my
addresses declared as RETENTIVE are not being
remembered by the PLC.

Anybody else see this happening?

 

mjamil

Member

Join Date

Apr 2002

Location

PK

Posts

162

• Jul 19, 2005

• #2

Nope!

unless something else is reseting the values!

 

paraffin power

Member

Join Date

Aug 2002

Location

Manchester

Posts

527

• Jul 20, 2005

• #3

I had a customer of ours report seeing this. I guessed the super-cap was on its way out. I sent him the battery module and the problem seems to have disappeared.
Pp

 

Ken J

Member

OP

K

Join Date

Feb 2005

Location

Mentor, Ohio

Posts

82

• Jul 20, 2005

• #4

paraffin power said:

I had a customer of ours report seeing this. I guessed the super-cap was on its way out. I sent him the battery module and the problem seems to have disappeared.
Pp

Click to expand...

Good point.....thanks for the tip Paraffin.