[?+]: OP77B to S7-300

kaiser17 · Post by **kaiser17** » Wed Sep 03, 2008 7:19 am

I am having very basic problem. Connecting OP77B to S7-300 CPU via Profibus. Here's steps I made:
- inserted HMI station (OP77B) in Netpro, connected it to existing Profibus network and configured address, transmission rate,...
- configured address, trans. rate, comm. channel in OP77B settings menu.
- added OP77B station as slave to PLC's Profibus master system in PLC's HW configuration
- connected OP77B (IF1B port) to PLC CPU DP port.

And now the problem. PLC doesn't see OP on it's profibus network.
OP is in transfer mode, DIP switches are all set to OFF (DP/MPI/PPI).
If I connect OP directly to CP5511 adapter and do the network scan, it finds the correct network rate, correct address.
What did I miss? Thank you for your answers!

bunglehead · Post by **bunglehead** » Wed Sep 03, 2008 2:12 pm

1. Did you download HW Config to PLC?
2. Did you check cable wiring and terminators' state?

zxcslo · Post by **zxcslo** » Wed Sep 03, 2008 4:07 pm

First of all: you don't need to add anything (OP) in HW configuration or Netpro.

All you need to do is config the OP in the Protool or WinCC Flexible:
- give the OP profibus address
- select network type: MPI or DP
- select the same speed you have in HW configuration for profibus

Transfer the configuration to the OP and it will start in ONLINE mode. Transfer mode is only for transfer the configuration from Protool or WinCC Flexible to the OP.

Now you must see the OP in the profibus network (network scan).

kaiser17 · Post by **kaiser17** » Thu Sep 04, 2008 6:31 am

Thanks for your help!
I managed to DL project to OP.
But now I can't DL project to OP again.
I put it in Transfer mode, set PG/PC to the same network mode as OP,
but WinCC Flex can't establish connection!???

kaiser17 · Post by **kaiser17** » Thu Sep 04, 2008 8:45 am

...finally got sick of everything and bought null modem cable... problem solved!

zxcslo · Post by **zxcslo** » Mon Sep 08, 2008 6:18 pm

kaiser17 wrote:Thanks for your help!
I managed to DL project to OP.
But now I can't DL project to OP again.
I put it in Transfer mode, set PG/PC to the same network mode as OP,
but WinCC Flex can't establish connection!???

This is probably because your PC/PG and OP have the same MPI/DP address. (1 is default for OP and also for PG/PC interface).
In the 'Set PG/PC interface' in control panel in your Windows you must set different address than OP.

I always set my PG to 0, OP to 1 (if I have only one OP) and PLC to 2...

zxcslo · Post by **zxcslo** » Tue Sep 09, 2008 10:20 am

kaiser17 wrote:Thanks for your help!
I managed to DL project to OP.
But now I can't DL project to OP again.
I put it in Transfer mode, set PG/PC to the same network mode as OP,
but WinCC Flex can't establish connection!???

I just remembered one thing:
On the OP in the Control panel in Transfer Settings you must enable in Channel 2 (MPI/DP) two things: - Enable channel
- Remote control

Without this two enabled you can't transfer over MPI/DP to the OP.
By default is enabled only Channel1: Serial.

Regards