Installation manual

Publication 1747-RM001G-EN-P - November 2008
SLC Communication Instructions 12-45
All three instructions use an integer control block for storing the instruction
parameters and a configuration setup screen, similar to the MSG instruction.
The CIP commands consist of a Service Code; the object Class, Instance, and
Attribute; and Send and Receive Data (if required for the selected Service
Code). The setup screen provides a list of standard CIP Services to select
from, including:
• Read Assembly.
• Write Assembly.
• Read Parameter.
• Write Parameter.
• Generic Get Attribute Single.
• Generic Set Attribute Single.
In addition, a Custom setting lets you enter any Service Code. For the CEM
and EEM instructions, send data and receive data are stored in separate data
table files. For the DEM instruction, send data and receive data are both
stored within the instruction control block.
ControlNet Explicit
Message (CEM)
This is an output instruction that lets you initiate unconnected CIP Generic
messages via a 1747-SCNR ControlNet scanner module installed in the local
chassis. These messages can be initiated to any nodes on the same ControlNet
network as the 1747-SCNR, regardless of whether the destination node is in
the scanner’s scan list or not, and regardless of whether the scanner is in Run
mode or Idle mode. Each scanner module can process only one CEM
instruction at a time. The instruction is similar in operation to a standard MSG
instruction.
CEM Instruction Parameters
Enter the following parameters when programming this instruction.
• Control Block is an integer file address that you select. It is a block of
words, containing the status bits and other data associated with the
CEM instruction.
• Control Block Length is a display-only field that indicates how many
integer file words are being used by the control block. For the CEM
instruction, the length is always 67 words.
Output Instruction
Fixed SLC
5/01
SLC
5/02
SLC
5/03
SLC
5/04
SLC
5/05
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