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IM 04L51B01-18EN
I/O Messages
System Configuration on PLC
An I/O message is also called an Implicit message. An I/O message is used to transmit pre-
specified I/O data at intervals. An I/O message is exchanged via a connection path which is
first set in RSLinx and read into RSLogix. A connection path defines the IP address of the
GX/GP, communication port of the PLC, and distinction of input/output.
A device, once configured in RSLinx, can be downloaded into an RSLogix project. The GX/
GP is configured as a “Generic Ethernet Module” in RSLogix.
Instance ID
Each data on the GX/GP corresponds to the instance ID of an Assembly object. Each data
value can be accessed as an INT32 or FLOAT type. In an I/O message, use an instance ID
to code the data on the GX/GP to be accessed. The following table lists instance IDs, sizes,
and data types.
• INT32
Type
Number
Operation type
Instance ID
Size
Data type
Input/Output channel
(GX/GP main unit)
0001 to 0050,
0101 to 0150
Producer
101
400 (4 x 100) INT32
0201 to 0250,
0301 to 0350
Producer
102
400 (4 x 100) INT32
0401 to 0450,
0501 to 0550
Producer
103
400 (4 x 100) INT32
0601 to 0650,
0701 to 0750
Producer
104
400 (4 x 100) INT32
0801 to 0850,
0901 to 0950
Producer
105
400 (4 x 100) INT32
(Expandable I/O 1)
1001 to 1050,
1101 to 1150
Producer
106
400 (4 x 100) INT32
1201 to 1250,
1301 to 1350
Producer
107
400 (4 x 100) INT32
1401 to 1450,
1501 to 1550
Producer
108
400 (4 x 100) INT32
(Expandable I/O 2)
2001 to 2050,
2101 to 2150
Producer
111
400 (4 x 100) INT32
2201 to 2250,
2301 to 2350
Producer
112
400 (4 x 100) INT32
2401 to 2450,
2501 to 2550
Producer
113
400 (4 x 100) INT32
(Expandable I/O 3)
3001 to 3050,
3101 to 3150
Producer
116
400 (4 x 100) INT32
3201 to 3250,
3301 to 3350
Producer
117
400 (4 x 100) INT32
3401 to 3450,
3501 to 3550
Producer
118
400 (4 x 100) INT32
(Expandable I/O 4)
4001 to 4050,
4101 to 4150
Producer
121
400 (4 x 100) INT32
4201 to 4250,
4301 to 4350
Producer
122
400 (4 x 100) INT32
4401 to 4450,
4501 to 4550
Producer
123
400 (4 x 100) INT32
(Expandable I/O 5)
5001 to 5050,
5101 to 5150
Producer
126
400 (4 x 100) INT32
5201 to 5250,
5301 to 5350
Producer
127
400 (4 x 100) INT32
5401 to 5450,
5501 to 5550
Producer
128
400 (4 x 100) INT32
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