MicroLogix 1500

Hello,

I am using a Micrologix1500 1764-24AWA and would like to add 3 expansion I/O modules.
(1)1769-OA8
(2)1769-IQ16
For some reason I have it in my head that if I add more then 2 expansion I/O I need a additional power supply.
Is this superstition on my part?

Thanks for any replies.

The Micrologix 1500 bases can handle up to 8 Compact I/O modules connected to it.

FYI depending on what series processsor/base you can have upto 16 modules. and you could also add a second rack with expansion PSU.

when you get the modules it says on the side what they draw from the 5v bus. and also from the 24v external supply you give them.
i do not have a processor/base to hand so i could not say if it tells you on that what the maximum draw is for the bus.

rob

For those you mention there is no need to install an additional PSU. Just the one that powers up your processor.

Doesn't RSLogix500 add up the currents as you add the modules in the I/O configuration and give a warning if close to max?

bernie_carlton said:

Doesn't RSLogix500 add up the currents as you add the modules in the I/O configuration and give a warning if close to max?

Click to expand...

Yup, just click on "Power Supply". Not sure about the warning.

Yeah I think it does bernie. It auto detects modules and sums it.

Edit: Beaten

i wasnt suggesting you need a second psu just an FYI if he ever wanted to expand over the maximum permissable current.

and yes burnie you are correct it auto configs the modules and gives you a warning in the dialogue box when you exceed the maximum current draw, but saying that we have a 1500 bxb which has about 10 16 point input and output modules and when i connect to it, it always warns me that it is exceeding the maximum but it never has any problems and it came from the US like that

rob