User manual

6 Detailed descriptions of I/O modules | Analogue input module UR20-8AI-I-PLC-INT
286 1432790000/08/12.2015Manual u-remote
Measurement range UR20-8AI-I-PLC-INT
Measurement range Current (I) Decimal (D) Hexadecimal Range Conversion
0 – 20mA
Siemens S7 format
23.52mA 32511 0x7EFF Overloading
D = 27648 x I/20
I = D x 20/27648
20mA 27648 0x6C00
Nominal range10mA 13824 0x3600
0mA 0 0x0000
0 – 20mA
Siemens S5 format
23.52mA 19268 0x4B44 Overloading
D = 16384 x I / 20
I = D x 20 / 16384
20mA 16384 0x4000
Nominal range10mA 8192 0x2000
0mA 0 0x0000
4 – 20mA
Siemens S7 format
22.81mA 32511 0x7EFF Overloading
D =27648 x(I – 4) / 16
I=D x16 / 27648 + 4
20mA 27648 0x6C00
Nominal range12mA 13824 0x3600
4mA 0 0x0000
1.19mA -4864 0xED00 Underloading
4 – 20mA
Siemens S5 format
22.82mA 19268 0x4B44 Overloading
D =27648 x(I – 4) / 16
I=D x 16 / 16384 + 4
20mA 16384 0x4000
Nominal range12mA 8192 0x2000
4mA 0 0x0000
0.8mA -3277 0xF333 Underloading
The following applies for all S7 ranges:
input value > overload range = 0x7FFF
input value < underload range = 0x8000
Additional status bits are set for S5.
Digital measured value representation in Siemens S5 format
Data bit 7 6 5 4 3 2 1 0
Byte 0 (high byte) 2
12
2
11
2
10
2
9
2
8
2
7
2
6
2
5
Byte 1 (low byte) 2
4
2
3
2
2
2
1
2
0
A F O
A: 0 = not active
1 = active
F: 0 = no line break
1 = line break
O: 0 = 0 to 4095 units
1 = ±4096 units (overflow)
Representation in two’s complement
2
12
= VZ in representation as amount and signs