Once you have set the IP address of the ml1400 make sure that you then change your pc's local area connection IP address to one that is on the same network as the ml1400. For example, set the ml1400=192.168.1.10 subnet 255.255.255.0 then computer will need to be set to 192.168.1.xxx, not 10...
For the SLC 503 I would delete any previously configured DF1 drivers in rslinx. Then configure the 1747-pic/aic+. It is possible that the port is configured for dh-485 and not df1.
Look at the communication LED that is labelled:
1. Lower End SLC Processors: COMM
2. Higher End SLC...
Along with Jraef's suggestions to insure correct param settings you should also check the following.
The firmware design uses parameter A082 for bus regulation mode.
Varying line conditions or motor regeneration can raise the bus voltage high enough to simulate a stalled motor condition and...
el124
Are you running Vista? If so see release notes here
Keep the following in mind when using RSLinx Classic v2.54.00 (CPR 9 Service Release 1) with Microsoft Windows Vista Business [32-bit] (Service Pack 1) or Microsoft Windows Vista Home Basic [32-bit] (Service Pack 1):
RSLinx Classic...
You should be using this driver. Attached a screen shot
1. Open RSEmulate
2. Use the FILE pull down menu and select OPEN
3. Select the file you want to run in RSEmulate and press the OPEN button
4. Assign the project a Station #. A Debug File # if used can also be specified.
5...