WAGO 750-455, Руководство пользователя

Страница: 27 / 48

WAGO-I/O-SYSTEM 750 Process Image 27
750-455 4AI 4-20mA S.E.
Manual
Version 1.2.0
Pos: 73 /All e Seri en (Allgemei ne Module)/Ü berschriften für alle Serien/__ noch nicht ei nsortierte Ü berschriften müssen noch einsorti ert werden __Pr ozessabbild - Überschrift 1 @ 4\mod_1240983067828_21.docx @ 31942 @ 1 @ 1
4 Process Image
Pos: 74 /Serie 750 ( WAGO-I/O-SYST EM)/Prozessabbild Kl emmenbus/Analogei ngangsklemmen/Pr ozessabbild 750- 0455 @ 5\mod_1251723807187_21.docx @ 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
Numeric Value
Status
Byte
Hex.
LED
Error
AI 1…4
Binary
Measured Value
Binary
Diagnostics
1)
Hex. Dez.
< 4.0 '0000.0000.0000.0 011' 0x0003 3 0x41 ON
4.0 '0000.0000.0000.0 000' 0x0000 0 0x00 OFF
5.6 '0000.1100.1101.0 000' 0x0CD0 3.280 0x00 OFF
7.2 '0001.1001.1001.1 000' 0x1998 6.552 0x00 OFF
8.8 '0010.0110.0110.1 000' 0x2668 9.832 0x00 OFF
10.4 '0011.0011.0011.0 000' 0x3330 13.104 0x00 OFF
12.0 '0100.0000.0000.0 000' 0x4000 16.384 0x00 OFF
13.6 '0100.1100.1100.1 000' 0x4CC8 19.656 0x00 OFF
15.2 '0101.1001.1001.1 000' 0x5998 22.936 0x00 OFF
16.8 '0110.0110.0110.0 000' 0x6660 26.208 0x00 OFF
18.4 '0111.0011.0011.0 000' 0x7330 29.488 0x00 OFF
20.0 '0111.1111.1111.1 000' 0x7FF8 32.760 0x00 OFF
> 20,0 '0111.1111.1111.1 011' 0x7FFB 32.763 0x42 ON
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 ungselemente/---Seitenwechsel--- @ 3\mod_1221108045078_0.docx @ 21810 @ @ 1