5 Memory map
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5.5
Process image
When power is supplied, the coupler recognizes all connected modules.
The coupler organizes a memory map that takes into account the module's type / data size as
well as the module's location, creating an internal process image. This area consists of the input
and output data area, as mentioned before.
Since digital I / O modules are managed in bit format and analog I / O modules are managed in
byte format, digital channels are grouped in byte units and add new bytes when they exceed 8
bits.
5.6
Example of memory map
5.6.1
Device
[0] ARIO-C-MT
Modbus TCP Coupler
[1] ARIO-S-AO02V
2-channel analog output modules (AO)
[2] ARIO-S-DI04P
4-channel digital input modules (DI)
[3] ARIO-S-AI02V
2-channel analog input modules (AI)
[4] ARIO-S-DO04P
4-channel digital output modules (DO)
[5] ARIO-S-AI02V
2-channel analog input modules (AI)
[6] ARIO-S-DO04P
4-channel digital output modules (DO)
[7] ARIO-S-DI04P
4-channel digital input modules (DI)
[8] ARIO-S-DO08P
8-channel digital output modules (DO)
[9] ARIO-S-DI04P
4-channel digital input modules (DI)
The coupler's diagnostic function is in-activated unless user intervention. In this example,
however, the process image (memory map) is assumed to be active to explain the add of
diagnostic data
5.6.2
Input process image
Byte
.7
.6
.5
.4
.3
.2
.1
.0
0
High Byte of Coupler Diagnostic
1
Low Byte of Coupler Diagnostic
2
DI1P4
DI1P3
DI1P2
DI1P1
3
Analog input module 1, channel 1, High byte
4
Analog input module 1, channel 1, Low byte
5
Analog input module 1, channel 2, High byte
6
Analog input module 1, channel 2, Low byte
7
Analog input module 2, channel 1, High byte
8
Analog input module 2, channel 1, Low byte
9
Analog input module 2, channel 2, High byte
10
Analog input module 2, channel 2, Low byte
11
DI2P4
DI2P3
DI2P2
DI2P1
12
DI3P4
DI3P3
DI3P2
DI3P1
DI1P1 stands for 1st Point of Digital Input Module 1.