86
Process Image
WAGO-I/O-SYSTEM 750
750-464 2/4 AI RTD configurable
Manual
Version 1.0.1
7.4.3
Pt500 (acc. IEC 751)
With the setting "Pt500 (acc. IEC 751)" and activated Siemens format, the I/O
module converts the resistance measured values of Pt500 sensors (acc. IEC 751)
and outputs them as temperature values.
The temperature values are displayed at a resolution of 1 digit per 0.5 °C.
The status information is depicted in bit 0 to bit 2 and the digitalized measured
value in bit 3 to bit 15.
Table 72: Process image for 750-464, Pt500 setting (acc. IEC 751)
Temperature
°C
Resistance
Ω
Numeric value
1)
with status information
4)
Status
byte
hex.
LED
error
AI 1, 2
Binary
XFÜ
Hex.
Dec.
---
< 9.00
'1111.0011.1000.0 011'
0xF383
-3197
0x51
on
Short circuit
2)
< -200.0
< 92.60
'1111.0011.1000.0 001'
0xF381
-3199
0x41
on
Underrange
3)
-200.0
92.60
'1111.0011.1000.0 000'
0xF380
-3200
0x00
off
-100.0
301.28
'1111.1001.1100.0 000'
0xF9C0
-1600
0x00
off
0.0
500.00
'0000.0000.0000.0 000'
0x0000
0
0x00
off
100.0
692.53
'0000.0011.1110.1 000'
0x0640
1600
0x00
off
200.0
879.28
'0000.1100.1000.0 000'
0x0C80
3200
0x00
off
500.0
1404.89
'0001.1111.0100.0 000'
0x1F40
8000
0x00
off
750.0
1803.19
'0010.1110.1110.0 000'
0x2EE0
12000
0x00
off
800.0
1878.52
'0011.0010.0000.0 000'
0x3200
12800
0x00
off
850.0
1952.41
'0011.0101.0010.0 000'
0x3520
13600
0x00
off
> 850.0
> 1952.41
'0011.0101.0010.0 001'
0x3521
13601
0x42
on
Overrange
3)
---
> 5500.00
'0011.0101.0010.0 011'
0x3523
13603
0x62
on
Wire break
2)
1) Temperature values below 0 °C are represented in two's complement binary.
2) When short circuit and wire break monitoring is ON (see section "Behavior in the Event of an
Error")
3) When underrange / overrange limit is ON (see section "Behavior in the Event of an Error")
4) Status information: X: Not used, F: Short circuit, wire break, Ü: Overrange