6 Application example: Modbus TCP
6.3 Communication examples: Modbus TCP
124
XI/ON: XNE-GWBR-2ETH-MB
10/2011 MN05002008Z-EN
www.eaton.com
6.3.6
Evaluation of the packed process data (inputs)
Intelligent modules
The input data of the intelligent modules occupy 10 registers
(register 0×0000 t
o
0×0008):
Figure 57:
Packed process
input data
– XN-2AI-I(0/4...20MA)
→
2 registers (0×0000 and 0×0001)
– channel 0: not used or input value at 0 mA in measurement range 0 to 20 mA
register 0×0000: 0×
00
0×
00
– channel 1: not used or input value at 0 mA in measurement range 0 to 20 mA
register 0×0001: 0×
00
0×
00
→
The module shows the lower measurement limit when the channel is not used.
– XN-2AI-THERMO-PI
→
2 registers (0×0002 and 0×0003)
– channel 0: thermo element type K connected.
register 0×0002: 0×
00
0×
D1
→
The module shows a measured temperature of 0×D1
≈
21.0 °C at channel 0.
– channel 1: no thermo element connected
register 0×0003: 0×
F5
0×
74
→
As the channel is not used, the module shows the minimum value at channel 1
(- 270 °C).
– XN-1AI-U(-10/0...10VDC)
→
1 register (0×0004)
– channel 0: register 0×0004: 0×
00
0×
00
→
As the module’s voltage input is not used, no voltage can be measured.
