mellow81

Thanks for your reply. I have a 2.7k ohm resistor in to limit the forward current to a nominal 8 mA. I did notice in the latest Baldor manual (DSMS series) that it makes no metion of requiring this resistor but still shows it in the wiring diagrams. In the old manual (DSM Series) they point it out with a warning about limiting the current and give suggested resistor values. Could this potentially be affecting my step input? I dont want to run the risk of removing the resistor and blowing the input.

Hi, I'm hoping someone is able to help me regarding the following problem and thanks in advance. I am using the PTO function on the ML1100 to drive a Baldor DSM 17 Stepper motor via a phoniex opto isolator. The Phoniex contact (PLC-OSC-24V/24V/2) has a frequency limit of 300 hz so I have set my PTO function file to a max frequency of 250 hz. The trouble is when I send a step output of 20 pulses I don't seem to get 20 steps on the baldor motor. I have attached a circuit diagram for ease of explaining (please excuse the messy writing but its 3 am when im writing this!!) The stepper motor inputs are wired as sinking as I have no choice hence the need for the opto isolator and the 24V reference voltage and forward current limiting resistor. I have setup my stepper motor to give 6400 steps per revolution however for one revolution I seem to get 2000. I have tried turning back the pto frequency to 10 hz but seem to get a few more steps (2300). Has anyone tried anything similar? Any thoughts as to what may be causing this would also be appreciated? IMAGE0046.PDF

The one I was having trouble with was used as a tempory unit for a couple of weeks( ethernet port wasn't used and came straight out of the box) before I got hold of it but the one that works was straight out of the box. Both were firmware 3.

Thanks to all who helped, I managed to get my hands on a spare ML1100 and plugged that in and setup it up as I had done before and it worked! Replugged my old one in and set it up again and no response. Can only put it down to a problem internally with the PLC?? I have found AB equipment normally to be pretty reliable in the past so is a bit of a surprise.

I'm not at work right now and won't get back for another 48 hours but this what I had setup. I can't remember the exact IP address for the first three parts of the IP address but was the same for the panelview and plc(ie xxx.xxx.xxx.100). I tried changing the PLC to another IP address with only the first two parts the same but didn't help. Both PLC and panelview were going through a unmanaged rail switch (Hirschmann Unmanaged SPIDER 5 Port 10/100 Ethernet Rail Switch) using only straight cables. No firewalls on the PC and don't know what the address of it was but Rs links was able to recongise the panelview. If this dosn't provide any clues I'll post the exact addresses and any other info when I get back to work. I appreciate the help! PLC ML1100 Channel 1 IP address: xxx.xxx.xxx.100 (wasn't able to ping) Subnet mask: 255.255.0.0 Gateway:0.0.0.0 Bootp and dhcp off HTTP sever and auto negotiate on Panelview PLus 600 IP address: xxx.xxx.xxx.108 (was able to ping) Subnet Mask: 255.255.0.0

Thanks for your reply, I had changed the CIP settings as recommened but to no avail. If I can't get a ping response is this possibly a problem on the PLC itself as I could get a ping response from the panelview?

Hi all, I am new to Ethernet comms (and probably missing something simple) and am experiencing a problem with the Ethernet ip driver in Rslinks in that it will pick up a panelview but not a micrologix 1100 PLC that I have connected through a rail switch. I have setup the ML1100 via channel 0 turning off bootp and dhcp and manually gave it an ip address but rslinks can’t see it for some reason. I have tried this on a different PC running same version and OP system (2000 and Rslink ver 2.5.020) but get the same result. I tried pinging the plc and wasn’t able to but was able to get the panelview. The network indicator lights are both on and I have replaced cabling etc to no avail. I found a previous thread that seemed to have a similar problem but looks like there was no final solution. Any help would be greatly appreciated. Previous thread

Hi all, I am upgrading the controls on a tablet press and want to communicate to a Danfoss FC302 drive using the channel 0 on the Micrologix 1100 (the ethernet port is connected to a panelview plus). I was told by danfoss that the drive is compatible with modbus and could use modbus to talk to the drive However the drive only has the FC protocol or standard bus available via the rs 485 comms and the info on their site is a bit vague. Has anyone done anything similar to this as I don't think this is possible? If possible or if anyone knows of another way and can explain it to me or has some sample code it would be greatly appreciated. Thanks in advance