
13
IM 04L41B01-18E
I/O Messages
System Configuration on PLC
AnI/OmessageisalsocalledanImplicitmessage.AnI/Omessageisusedtotransmit
pre-specifiedI/Odataatintervals.AnI/Omessageisexchangedviaaconnectionpath
which is first set in RSLinx and read into RSLogix.A connection path defines the IP
addressoftheDX,communicationportofthePLC,anddistinctionofinput/output.
Adevice,onceconfiguredinRSLinx, canbedownloadedinto anRSLogixproject.The
DX is configured as a "Generic Ethernet Module" in RSLogix.
Instance ID
Each data on the DX corresponds to the instance ID of an Assembly object. In an I/O
message, use an instance ID to code the data on the DX to be accessed. The following
tablelistsinstanceIDs,sizes,anddatatypes.
Type Number Operation type Instance ID Size Data type
Measurement
channel
001 – 048 Producer 110 192 (4 x 48) INT32
001 – 048 Producer 115 192 (4 x 48) FLOAT
Computation
channel
101–160 Producer 120 240(4x60) INT32
101–160 Producer 125 240(4x60) FLOAT
Communication
input data
C01–C60 Producer / Consumer 130240(4x60) INT32
C01–C60 Producer/Consumer 135 240(4x60) FLOAT
External input
channel
201 – 300 Producer/Consumer 140 400 (4 x 100) INT32
301 – 400 Producer/Consumer 141 400 (4 x 100) INT32
401 – 440 Producer/Consumer 142 160(4x40) INT32
201 – 300 Producer/Consumer 145 400 (4 x 100) FLOAT
301 – 400 Producer/Consumer 146 400 (4 x 100) FLOAT
401 – 440 Producer/Consumer 147 160(4x40) FLOAT
201 – 300 Producer 150 400 (4 x 100) INT32
301 – 400 Producer 151 400 (4 x 100) INT32
401 – 440 Producer 152 160(4x40) INT32
201 – 300 Producer 155 400 (4 x 100) FLOAT
301 – 400 Producer 156 400 (4 x 100) FLOAT
401 – 440 Producer 157 160(4x40) FLOAT
-Configuration 190 0 -
-Producer/Consumer 191 0 -
Explanation
• TheDXdatacanbeaccessedusingtheINT32orFLOATtype.Datacanbeaccessed
by the type based on the specified instance ID.
• The operation type "Producer" indicates a read-only instance and "Producer/
Consumer"indicatesaread/writeinstance.
• Foranexternalinputchannel,instanceIDs150to157areforreadingand140to147
are for writing.
Data on the DX
SeetheexplanationintheprevioussectiononExplicitmessages.