Triplett

Learning about MicroLogix 1500

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I am new to Allen Bradley and am experimenting with a MicroLogix 1500 system. Base is 1764-24BWA Series B, Processor is 1764-LRP Series C. I only have 110V hooked to it right now, just seeing if I can see it with my PC - RSLinx lite 2.58.00.15 . When I power on the unit it cycles the power light, then power light goes solid green and fault steady blinks red. Verified COM port for USB-serial is 4, go into RSLinx and configure RS-232 to COM4 and try to auto config but no response. I tried DCOMM mode also, no response. I have USB-serial for both 9 pin and round 8 pin connectors.

Do I need anything else wired to unit? Maybe the different series is stopping functionality? Maybe I need different version of RSLinx (Windows 10)? I'm at a loss where to start.

Thanks in advance!

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What USB-RS232 converter are you using?  If it is a cheaper converter, the COM port emulation won't be very good.  You may want to try a different converter.  I have one that I use that is very compatible, but even mine runs into issues occasionally.

Native RS232 is always the best way to go, I bought an old Win XP Toughbook for working with this type of old technology.

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The first thing I always try when having trouble with RS-232 communications is a null modem adapter. If that doesn't work, then try a different virtual COM port. I've had very good service from the Keyspan USA-19HS.  The only serial devices that haven't worked with that one haven't worked with any adapter and require a native COM port.

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Also, look in your computer Device Manager, see if your com port shows the adapter, the driver is working, etc.

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Use the  Keyspan USA-19HS  for years with no issues.

Hope I did not Jinx anything 

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Ahh, 1500 is the worst of both worlds. Micrologix addressing and compactlogix card costs.

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On ‎9‎/‎4‎/‎2019 at 0:15 PM, jaden said:

Also, look in your computer Device Manager, see if your com port shows the adapter, the driver is working, etc.

This is one that bites fairly often...

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1 hour ago, NevergoldMel said:

Ahh, 1500 is the worst of both worlds. Micrologix addressing and compactlogix card costs.

It's better than  than the Micro 850 unless your need something to throw on the fire to keep yourself warm. I think the Micro850 would be better in that case.

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Honestly, I prefer to use ClickPLC's if I have to go cheaper than CompactLogix.

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On 9/6/2019 at 9:58 AM, Michael Lloyd said:

It's better than  than the Micro 850 unless your need something to throw on the fire to keep yourself warm. I think the Micro850 would be better in that case.

Whats wrong with the 850s!? I like them 

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The hardware is fine. The programming software is pathetic. I’d rather write a SLC, S5, or S7-200 program. Time is money

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then power light goes solid green and fault steady blinks red.

Is the Fault LED on steady red, or is it blinking (at about 1/sec) ?    

A steady FAULT LED means an unrecoverable hardware diagnostic failure;  the PLC generally has to be replaced.

A blinking FAULT LED means that the controller is simply faulted;  it might have drained the memory retention battery, or be reacting to being in a new hardware configuration, or something else.

 

For your comms, try sticking with the default MicroLogix settings when you press DCOMM and that LED comes on green.   19200/8/N/1 speed and framing, SLC-Ch0/MicroLogix device type, CRC error checking, DF1 Full Duplex.    That way you don't have to rely on Autoconfigure.

 

 

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On 10/2/2019 at 2:12 PM, Michael Lloyd said:

The hardware is fine. The programming software is pathetic. I’d rather write a SLC, S5, or S7-200 program. Time is money

it took me a little to get used to it, I like CCW now, and its not just for controllers. setting/backing up drives is a breeze compared to executive. 

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I've been trying to get my boss to stop with the mircologix entirely.
If they can't afford compactlogix I'd rather use the ClickPLCs at least you can get them to do a PID loop without knocking the universe apart.

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