Struthers-Dunn PLC (ca 1977) any help?

[onavi]

hello
I have inherited a (USED) barber-colman hobbing machine
It was sent up here from a sister company.
The majority of the schematics are missing.
It has a Struthers-Dunn inc. PLC
Model 75415 Serial# 11191 S-D77 controller
and S-D 64 expander.(probably ca 1977)
I have the statement list for the plc program
and a list of inputs & outputs.
I cannot get the sequence of operation behond a certain point
and not having the ladder schematic I am unable (as yet)
to get to the bottom of this.
I have some familiarity with Omron PLC instruction set
but I am unfamiliar with the Stuthers-Dunn.
Could some one kindly give me an idea of the
meaning of the intructions?

HERE THEY ARE:
(the first column is the instruction
the second is the address)

CMR (NO ADDRESS GIVEN) FIRST INSTRUCTION
CEN (NO ADDRESS GIVEN) SECOND INSTRUCTION
LDA 024
ORC 024
STO 025
OR 001
AND 105
LDAC 057
MR 000
ANDC 105
CMR 000 (ADDRESS GIVEN IN THIS INSTANCE)

(AND SO ON FOR 924 STATEMENTS)

And as far as I can see there are no other instructions in
the whole program (which has aprox. 924 statements)

 

[JesperMP]

Phew... Without a manual you are lost.

Ready Engineering claims to be Struthers Dunn "proficient".

PLC center Says they can service Struthers Dunn PLCs.

Magnecraft has taken over Struthers Dunn, but there is no mention of any PLCs on their website.
It was probably discontinued years (decades ?) ago. The chance that there is still someone that can help you is VERY small.

 

[elevmike]

I hate to be the one to say it, but I think your looking at a reverse engineering job with a new plc.

Best of luck.

Mike

 

[Davesjunk]

Struthers Dunn plc

I may be able to help you. Way back then I installed numerous strut hers Dunn Plc s and built test equipment an d repaired mod ules

 

[jkerekes]

I hope he figured it out by now after 12 years.

 

[Gene Bond]

About all I remember is the 70# programmer

 

[Dryska]

Struthers Dunn plc question. I wish I could have seen your question when it was poste

hello
I have inherited a (USED) barber-colman hobbing machine
It was sent up here from a sister company.
The majority of the schematics are missing.
It has a Struthers-Dunn inc. PLC
Model 75415 Serial# 11191 S-D77 controller
and S-D 64 expander.(probably ca 1977)
I have the statement list for the plc program
and a list of inputs & outputs.
I cannot get the sequence of operation behond a certain point
and not having the ladder schematic I am unable (as yet)
to get to the bottom of this.
I have some familiarity with Omron PLC instruction set
but I am unfamiliar with the Stuthers-Dunn.
Could some one kindly give me an idea of the
meaning of the intructions?

HERE THEY ARE:
(the first column is the instruction
the second is the address)

CMR (NO ADDRESS GIVEN) FIRST INSTRUCTION
CEN (NO ADDRESS GIVEN) SECOND INSTRUCTION
LDA 024
ORC 024
STO 025
OR 001
AND 105
LDAC 057
MR 000
ANDC 105
CMR 000 (ADDRESS GIVEN IN THIS INSTANCE)

(AND SO ON FOR 924 STATEMENTS)

And as far as I can see there are no other instructions in
the whole program (which has aprox. 924 statements)

I wish I could have seen this post when it was current. I have extencive experience with this programming format. I installed several of these controls back in the early 70's I worked very close with Struthers Dunn on several installations at Ford Motor co. I even repaired the circuit boards. They were a great co to work with