Allen Bradley ML1500 error
Allen Bradley ML1500 error
(OP)
Hi, this is a novice area for me. Have an old fairground ride with this AB ML1500 plc, the fault light has started flashing, displayed fault code is 0080. Looked this up on-line and it stated that the terminator module is disconnected. It definitely isn't and looks fine!
Is it worth trying a new module?
We don't have RSLogix or similar software.
Grateful for any advice
Is it worth trying a new module?
We don't have RSLogix or similar software.
Grateful for any advice
RE: Allen Bradley ML1500 error
Then the communication on the bus or the backplane on the I/O modul can't communicate.
But the fault message will probably be that there is no "end resistor" at the end terminating the bus or the I/O module since it is needed to make the communication working in the first place.
Have never worked with Allen Bradley PLC:s but most buses are usually built on the same principle.
Best Regard A
“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein
RE: Allen Bradley ML1500 error
Brad Waybright
The more you know, the more you know you don't know.
RE: Allen Bradley ML1500 error
There is a devicenet module displaying 0080, see pic, and I assumed that this was an error message for the plc (it says address/error above it) but I think I was mistaken. So I have now got a programming lead and a laptop with the RSlogix software and see if I can find out what is going on.
RE: Allen Bradley ML1500 error
it seems that the CPU isn't in RUN which I also can se at on the picture that it isn't.
https://literature.rockwellautomation.com/idc/grou...
Chapter 8
80 In Idle Mode Module is in Idle mode.
Put the controller into RUN mode and enable the RUN bit in the Module Command Array. See
page 16.
Best Regards A
“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein
RE: Allen Bradley ML1500 error
RE: Allen Bradley ML1500 error
Best Regards Anna
“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein
RE: Allen Bradley ML1500 error
Devicenet is an extension of CANBus, which needs terminator resistors at both ends of the bus (across CAN-H & CAN-L if I remember correctly). I'm not familiar enough with the AB products to know if there's an option or a switch that does the local end termination.
The other possibility of course, is that the bus has become broken somewhere and the section with the terminator on the other end is no longer connected.
EDMS Australia
RE: Allen Bradley ML1500 error
May have lost the program. Do you have an electronic copy?
RE: Allen Bradley ML1500 error
Brad Waybright
The more you know, the more you know you don't know.
RE: Allen Bradley ML1500 error
Thanks for the replies folks
RE: Allen Bradley ML1500 error
Curiously wondering if there's any progress?
Brad Waybright
The more you know, the more you know you don't know.
RE: Allen Bradley ML1500 error
Yes and no (but mainly no). We did get plugged in using RSLinx Classic and learned that one of the adjacent i/o modules was faulty, when we eventually got a replacement we found that the plc now runs (run light on, no fault light) although the ride still doesn't operate due to unexpected plc outputs. I'm due to go back on Tuesday for another look, and will post any progress.
Peter
RE: Allen Bradley ML1500 error
Brad Waybright
The more you know, the more you know you don't know.