Siemens SIMATIC Distributed I/O ET 200eco PN Operating Instructions Manual page 186

Temperature unit
Standard temperature unit
Celsius
Fahrenheit
Kelvin
Climatic temperature unit
Celsius
Fahrenheit
Kelvin
NOTE
You can use a separate reference junction for each channel due to the flexible structure of
the data record DS2. You can also combine channels with the user program so that they use
the same reference junction. All channels that operate with the same reference junction tem­
perature must have the same temperature value in the DS2.
User program
The following user program shows an example for the compensation type "Dynamic
reference temperature" of channels 0 to 7 of the I/O device 8 AI RTD/TC 8xM12 of an RTD
module. The reference junction temperature of the RTD module applies to all channels of the
I/O device 8 AI RTD/TC 8xM12.
Requirements:
• Input address of the I/O device 8 AI RTD/TC 8xM12: 120 (module address)
• Input address of the RTD module: 136 (channel address)
• Request bit for SFB "WRREC": M 20.0
• Busy bit for SFB "WRREC": M 20.1
• Memory for data transmission: MW 0 to MW 16
STL
UN M 20.0
UN M 20.1
SPB END
U M 20.1
SPB WRT
// Create memory for data transmission
L B#16#1
T MB 0
L B#16#0
T MB 1
L PIW 136
T MW 2
ET 200eco PN
Operating Instructions, 06/2022, A5E01250250-AN
Decimal
-1450 to 1550
-2290 to 3110
1282 to 4282
-14500 to 15500
-22900 to 31100
12815 to 32760
Explanation
Checking the request: New Dynamic Ref. Temp.
Checking if WRREC is "Busy"
skip if no transmission is required
Checking if WRREC is "Busy"
Transmit temperature in hundredths of a degree (Pt100 Climatic)
Transmit temperature in Celsius
Read in reference junction temperature of an RTD module in the plant
for channel 0 of the 4 AI RTD/TC
I/O device analog input/analog output
10.1 I/O device analog input
Hexadecimal
FA56 to 60E
H H
F70E to C26
H H
502 to 10BA
H H
C75C to 3C8C
H H
A68C to 797C
H H
320F to 7FF8
H H
187