Process Image - WAGO 750-455 User Manual

WAGO-I/O-SYSTEM 750
750-455 4AI 4-20mA S.E.
Pos : 73 /All e Seri en (Allgemei ne Module)/Ü berschriften für alle Serien/__ noc h nic ht ei ns ortierte Ü berschriften müss en noc h eins orti ert werden __Pr oz ess abbild - Übersc hrift 1 @ 4\mod_1240983067828_21.doc x @ 31942 @ 1 @ 1
4

Process Image

Pos : 74 /Serie 750 ( WAGO-I/O-SYST EM)/Proz ess abbild Kl emmenbus /Analogei ngangs klemmen/Pr ozessabbild 750- 0455 @ 5\mod_1251723807187_21.doc x @ 41164 @ @ 1
The I/O module provides 1 status byte (8 bits) and 1 data word (16 bits) per
channel.
Whether the status byte is read out via the fieldbus depends on how diagnostic
information is transmitted by the respective fieldbus or fieldbus
couplers/controllers used. In any case, the status byte can be read out using the
WAGO-I/O-CHECK commissioning tool via the service port of the fieldbus
coupler/controller.
The I/O module detects the input current range 4 mA ... 20 mA with a resolution
of 12 bits. The measured value is mapped to bits B15 ... B3 of the data word. Bits
B1 and B0 carry diagnostic information, bit B2 is reserved and has no defined
value. If the measuring range is overrange or underrange or there is a wire break,
the I/O module transmits the next displayable measured value and sets B0 and B1
to the value 1.
Simplified interpretation of the measured value!
The measured value can also be easily obtained in that the complete data word is
interpreted as a 16-bit integer value. The measuring range is then scaled to the
numerical value range of 0x0000 to 0x7FFF. The decimal places of the resulting
analog value corresponding to the lower three bits, however, must be ignored.
The following table shows examples:
Table 16: Process Image of the I/O Module, Examples of Process Values
Input Current
0 mA ... 20 mA
< 4.0
4.0
5.6
7.2
8.8
10.4
12.0
13.6
15.2
16.8
18.4
20.0
> 20,0
1)
Bit B2: not defined
Bit B1 and bit B0: Indicates if the measuring range is overrange / underrange or if there is a wire break
Pos : 75 /D okumentation allgemei n/Glieder ungs elemente/---Seitenwechs el--- @ 3\mod_1221108045078_0.doc x @ 21810 @ @ 1
Manual
Version 1.2.0
Numeric Value
Binary Binary
Measured Value Diagnostics
'0000.0000.0000.0 011'
'0000.0000.0000.0 000'
'0000.1100.1101.0 000'
'0001.1001.1001.1 000'
'0010.0110.0110.1 000'
'0011.0011.0011.0 000'
'0100.0000.0000.0 000'
'0100.1100.1100.1 000'
'0101.1001.1001.1 000'
'0110.0110.0110.0 000'
'0111.0011.0011.0 000'
'0111.1111.1111.1 000'
'0111.1111.1111.1 011'
Process Image
Hex. Dez.
1)
0x0003 3
0x0000 0
0x0CD0 3.280
0x1998 6.552
0x2668 9.832
0x3330 13.104
0x4000 16.384
0x4CC8 19.656
0x5998 22.936
0x6660 26.208
0x7330 29.488
0x7FF8 32.760
0x7FFB 32.763
27
Status LED
Byte Error
Hex. AI 1...4
0x41 ON
0x00 OFF
0x00 OFF
0x00 OFF
0x00 OFF
0x00 OFF
0x00 OFF
0x00 OFF
0x00 OFF
0x00 OFF
0x00 OFF
0x00 OFF
0x42 ON