Micrologix 1400 embedded I/O mapping

Howdy all,
New to the 1400. I have read the manual a few times (maybe not every word) but still can not find where the embedded discreet inputs are mapped. The expansion modules are easy but where is the embedded stuff? I assumed it would be under inputs and the lower words would be set up as arrays. But nooooooooo they don't seem to be there.
1766-L16AWAA

Thanks

The embedded inputs are mapped as I:0, the embedded outputs are O:0

That's what I figured however 500 is complaining that the address must be specified to the word level for what I assume to be bits. I'm cornfused. I also don;t see the embedded outputs in the embedded I/O configuration.

ltfordnr said:

That's what I figured however 500 is complaining that the address must be specified to the word level for what I assume to be bits. I'm cornfused. I also don;t see the embedded outputs in the embedded I/O configuration.

Click to expand...

User Manual:

http://literature.rockwellautomation.com/idc/groups/literature/documents/um/1766-um001_-en-p.pdf

Instruction Reference:

http://literature.rockwellautomation.com/idc/groups/literature/documents/rm/1766-rm001_-en-p.pdf

Have a look at Page 27 of the Instruction Reference - I/O Addressing. The Embedded I/O is Slot 0 - Word 0 for both Inputs and Outputs.

Try something like I:0.0/0, and see if it likes that better. That should point at Input Slot 0, Word 0, Bit 0.

Stu.....

Thanks for the reply but that's exactly the problem.
All indications are that the bit (I:0.0/0 - 20) can be used but logix 500 complains with 'address must be specified to the word level' when I try to access the bit.

What is the instruction you are using when 'trying to access that bit'?

MicroLogix embedded I/O Mapping

I understand the digital I/O addressing. What about the Analog Inputs and Outputs

For the embedded analog see picture below.

And welcome to the forum.

Thanks Michey, You info is correct. I had just found the it 5 minutes ago. My 1st Question answered. Batting 1,000!

FandA said:

Thanks Michey, You info is correct. I had just found the it 5 minutes ago. My 1st Question answered. Batting 1,000!

Click to expand...

That's "Mickey" with a "k". Batting .999.

Ethernet communication between Mico 1400 and Compact

Another question-Ethernet commuunication between the CompactLogix and the Micro 1400 - What message instruction to use - PLC5 tye read and Write or what? I just joined plctalk yesterday and learning how to use this forum but need some answers. You guys have already been a big help.
Thanks

Simple Embedded I/O Map:

Here is the embedded I/O map for the 1400 laid out simply:

The 20 Discrete Inputs are addressed by two equivalent schemes:
Inputs 0-19 are I:0.0/0 through I:0.0/19
-or- (as referenced as bits of 16-bit words)
Inputs 0-15 are I:0.0/0 through I:0.0/15
Inputs 16-19 are I:0.1/0 through I:0.1/3

The 4 Analog Inputs are addressed:
Analog Input 0 (IV0) is I:0.4
Analog Input 1 (IV1) is I:0.5
Analog Input 2 (IV2) is I:0.6
Analog Input 3 (IV3) is I:0.7
These are 0-10vdc inputs.
IN CODE: values of 0-4096 equal voltage inputs of 0-10v
For current loop instruments (like 4-20ma) wire a 500ohm 1% resistor between the COM_ANA and the input terminal (IV0, IV1, IV2, IV3). You'll need 1 resistor per input.

The 12 Discrete Outputs are addressed:
Outputs 0-11 are O:0.0/0 through O:0.0/11

The 2 Analog Outputs are addressed:
Analog Output 0 (OV0) is O:0.4
Analog Output 1 (OV1) is O:0.5
These are voltage outputs that range from 0vdc to 10vdc.
IN CODE: values of 0-4096 equals voltage outputs of 0-10v

There's more than one way to do it, but my preference for situations like yours is a SLC typed read MSG for both processors.