Control block layout – Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) User Manual
Page 287
Chapter 15
Using Communication Protocols
15–3
The following table illustrates combinations of message types and target
devices and their valid file types.
Command Type
Message
Type
Initiating Device
Valid File
Types
Target Device
➀➁➂
Valid File Types
SLC500/ML1000
Write
MicroLogix 1000
O,I,S,B,T,C,R,N
MicroLogix 1000
O,I,S,B,T,C,R,N
SLC500/ML1000
Read
MicroLogix 1000
O,I,S,B,T,C,R,N
MicroLogix 1000
O,I,S,B,T,C,R,N
CIF
Write
MicroLogix 1000
O,I,S,B,T,C,R,N
MicroLogix 1000
N7
CIF
Read
MicroLogix 1000
O,I,S,B,T,C,R,N
MicroLogix 1000
N7
SLC500/ML1000
Write
MicroLogix 1000
O,I,S,B,T,C,R,N
SLC 500
O
➃
,I
➃
,S,B,T,C,R,N
SLC500/ML1000
Read
MicroLogix 1000
O,I,S,B,T,C,R,N
SLC 500
O
➃
,I
➃
,S,B,T,C,R,N
CIF
Write
MicroLogix 1000
O,I,S,B,T,C,R,N
SLC 500
N9
CIF
Read
MicroLogix 1000
O,I,S,B,T,C,R,N
SLC 500
N9
➀
The DF1 Full-Duplex protocol can be used if the target device supports it. Such devices include MicroLogix
1000 controllers (any series), SLC 5/03, SLC 5/04 and SLC 5/05 processors, and PLC-5 processors (CIF
command type only).
➁
The DH-485 protocol can be used if the target device supports it. Such devices include MicroLogix 1000
controllers (except for Series A and B discrete controllers) and SLC 500, SLC 5/01, SLC 5/02, SLC 5/03, SLC
5/04 or SLC 5/05 processors.
➂
The DF1 Half-Duplex protocol can also be used with Series D or later discrete and all analog MicroLogix 1000
controllers, but a master is required, such as an SLC 5/03, SLC 5/04 or SLC 5/05 processor.
➃
SLC 500, SLC 5/01, and SLC 5/02 processors do not support O or I file access from a MSG instruction.
SLC 5/03, SLC 5/04 and SLC 5/05 processors do support O and I file access, but only when unprotected.
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