Ethernet/Ip Explicit Message (Eem); Eem Instruction Parameters; Eem Instruction Setup Screen Parameters - Allen-Bradley SLC 500 Series Reference Manual

12-58 SLC Communication Instructions
EtherNet/IP Explicit
Message (EEM)
Fixed SLC SLC SLC
5/01 5/02 5/03
Publication 1747-RM001G-EN-P - November 2008
This output instruction lets you initiate connected CIP Generic messages via
channel 1 on a SLC 5/05 processor. These messages can be initiated to
EtherNet/IP nodes on the same Ethernet network as the SLC 5/05 or can be
bridged through a ControlLogix gateway to nodes on remote ControlNet or
Ethernet networks. The instruction is similar in operation to a standard MSG
instruction.

EEM Instruction Parameters

SLC SLC
5/04 5/05
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
EEM 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 EEM
instruction, the length is always 58 words.

EEM Instruction Setup Screen Parameters

Parameters for This Controller on the General Tab
• Channel
Always 1.
• Size in Words (Receive Data)
This field defines the size of the integer data file that will be used to
store the data that is returned by this explicit message command. For
best performance, define this file size to only be as large as is required. If
no receive data is expected, you may leave this field at 0 and no receive
data file will be defined. If unsure of how much data will be returned,
you may select up to the maximum size of 124 words, and then reduce
the size later based on experience.
• Size in Words (Send Data)
This field defines the size of the integer data file that will be used to
store the data that is sent along with this explicit message command. For
best performance, define this file size to only be as large as is required. If
no send data is required, you may leave this field at 0 and no send data
file will be defined. If unsure of how much data will be sent, you may
select up to the maximum size of 124 words when defining the
instruction, and then reduce the size later based on experience.