Assigned modbus register addresses of i/o signals, Analog scaling – Rockwell Automation 1758-RTU202 DataSite Hardware User Manual User Manual
Page 52

Publication 1758-UM001D-EN-P - June 2011
52 Operating the Controller
Assigned Modbus Register
Addresses of I/O Signals
The I/O points of the controller are:
6AI-3HART-8DI-4DO-2AO-3PI-1RS232-1RS232/1RS485-1Ethernet-12VDC
When we read or write those signals, we only need to read or write the
registers as shown in the following table.
Analog Scaling
For 8AI (4…20 mA)
For 6AI (0…10V):
Signal
Registers
Value range
Meaning
6AI
30001…30006
10000…50000
Unsigned short data, standard value,
readable only.
2HART
(2AI)
30007…30008
10000…50000
Unsigned short data, standard value,
readable only.
8DI
10001…10008
1, 0
BOOL data, readable only
3DI (PI)
10009…10011
1, 0
BOOL data, readable only (when you
use PI as DI)
4DO
00001…00004
1, 0
BOOL data, readable or writable
2AO
40001…40002
10000…50000
Unsigned short data, standard value,
readable or writable
3PI
30011…30016
32-bit int
Unsigned integer data, readable only
Current
Standard value
4.00 mA
10000
8.00 mA
20000
12.00 mA
30000
16.00 mA
40000
20.00 mA
50000
Voltage
Standard value
0.000V
10000
2.500V
20000
5.000V
30000
7.500V
40000
10.000V
50000