Rockwell Automation 1761 MicroLogix 1000 Programmable Controllers - Manual (Page 253)

Using the Message Instruction
13–5
Control Block Layout
The control block layouts shown below illustrate SLC500/ML1000 type messages.
EN ST DN ER EW NR TO Error Code
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Reserved for length (in elements)
Control Block Layout – SLC500/ML1000
Word
0
1
2
File Number
File Type (O, I, S, B, T, C, R, N)
Element Number
Subelement Number
3
4
5
6
Node Number
EN ST DN ER EW NR TO Error Code
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Reserved for Length (in elements)
Control Block Layout – 485CIF
Word
0
1
2
Offset Bytes
Not used
Not used
Not used
3
4
5
6
Node Number
Programming