WAGO I/O System 750
Process Image 31
753-482 2AI 4-20mA 12 Bit S.E. HART
Manual
Version 1.2.0
Table 17: Process Values for the HART Module
Input Current
4 mA … 20 mA
Numeric Value
Status
Byte
Hex.
LED
Error
AI 1, 2
Binary
Measured Value
*)
F O
Hex.
Dec.
<3
'0000.0000.0000.00
11'
0x0003
3
0x41
on
<4
'0000.0000.0000.00
00'
0x0000
0
0x00
off
4
'0000.0000.0000.00
00'
0x0000
0
0x00
off
6
'0001.0000.0000.00
00'
0x1000
4096
0x00
off
8
'0010.0000.0000.00
00'
0x2000
8192
0x00
off
10
'0011.0000.0000.00
00'
0x3000
12288
0x00
off
12
'0100.0000.0000.00
00'
0x4000
16384
0x00
off
14
'0101.0000.0000.00
00'
0x5000
20480
0x00
off
16
'0110.0000.0000.00
00'
0x6000
24576
0x00
off
18
'0111.0000.0000.00
00'
0x7000
28672
0x00
off
20
'0111.1111.1111.11
00'
0x7FFC
32764
0x00
off
>20
'0111.1111.1111.11
00'
0x7FFC
32764
0x00
off
>22
'0111.1111.1111.11
01'
0x7FFD
32765
0x42
on
*) Status bits: F = Cable Break, O = Overrun
4.1
2 AI 4-20 mA + 6-Byte Mailbox
In the “2AI + 6-byte mailbox” operating mode the HART module provides the
fieldbus coupler/controller with a 12-byte input and output process image via one
logical channel.
1 control byte (C0) and 1 status byte (S0) are used to monitor the data flow.
The data is mapped in the cyclic process image of the connected
coupler/controller. However, the HART commands can then be implemented by
the “WagoLibHart_0x.lib” PLC library. The data is tunneled to the application via
a mailbox and decoded by means of the library so that evaluation and processing
take place directly at the application level.
The IEC application can be implemented in the connected programmable
fieldbus controller (PFC) of the fieldbus node with the WAGO-I/O-
PRO
programming tool or, if a fieldbus coupler is connected, in the superimposed
controller.