Problem connecting S7-300/S7-200 by MPI

Hello guys,

I want to read a S7-226 with use of the "X Get" (SFC67) command in Step 7(V5.2) from a CPU313C. I use a PG 720 II from siemens (MPI-connection)

I have read the manuals, but cannot find the right solution.

This is what I did:

I connect the MPI cables parallel to each other.

Properties CPU313C:
MPI, Adress 2, Networked: yes, 187.5 kbps.

Communications setup S7-226:
CP5611 (MPI), remote adress = 4, MPI, 187.5 kbps, mode 11bit.

In Step 7 accessible nodes shows:
- "MPI=2" (+ shows blocks)
- "MPI=4 (passive)" (+ shows blocks)

In OB1 I call FC3 (LAD),in the first line is the X GET-command:
Req in=I124.0=1, Cont=I124.1=1, Dest Id=W#16#4, Var_addr=I0.0, Ret val=MW1002, Busy= M10.0=changing between 0 and 1, RD= Q124.0
Ret Val and RD doesn't show any value during Monitoring.

The CPU313C and CPU226 can be monitored from the PG.

Can anyone confirm which settings are OK, and what not.
How to be shure that the 226CPU is a Slave?

I really hope somebody can help me with this.

Erik

Any Data Type

For your Var_Addr: p#i0.0 byte 1
also
for your RD: p#q124.0 byte 1

Since you probably don't want all of your outputs coming on if any inputs i0.0-i0.7 come on in the 200, I would use p#m10.0 byte 1 and then use m10.0 to turn on q124.0

One other thing I suspect that your ret_val is mw102 not mw1002 - I think that is outside that PLC's address range.

Hope that helps.

oops

Or you could use p#i0.0 bool 1 and p#q124.0 bool 1

I am so used to getting more info, but I think if you use that format the instruction will work.

Good luck.

Thanks Sylent,

I will try this.
I only use this 1 input for testing, ofcourse I want to get more data from this PLC later.

Erik

Hello Sylent,

It still does't work.
Direct adressing shouldn't be a problem I think.

Erik

Sorry

When I've had instructions with ANY data types I found they didn't work without specifying a length.

Have you tried reading m or data block memory versus i/q? Also are you retriggering the req? And when you retrigger do you get any feedback in MW102?

Hello Sylent,

I'v tried that, no succes.
In a few month I will go to the S7-300 training.
I think this is a good question.
They organise a 3 day training, tailor made for 3 people, and we can bring our own subjects and projects.
So I can wait for that, my question is not so urgent.

But thank you for your attention so far!

If I find the problem, I will tell you about it.

Erik