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Addressing I/O extension modules and RAD-900-DAIO6 with Modbus RTU
3827_en_B
PHOENIX CONTACT
Error codes and formats for Pt 100 values
Table 9-9
Representation of the RAD-PT100-4-IFS Pt 100 values
9.7
RSSI signal register
The RSSI values indicate the received signal strength on the wireless module. In both
PLC/Modbus RTU and PLC/Modbus RTU dual modes, you can read the RSSI values via
the serial interface of the master wireless module (RAD ID = 01) using Modbus/RTU com-
mands. The RSSI values of all wireless modules are within the address area
35001 ... 35250.
Table 9-10
RSSI signal register
–
Bits 8 ... 15 are reserved.
–
Values < 255 indicate the RSSI value in -dBm.
–
The value 255 means that the RSSI value is invalid or the device cannot be reached.
Example for reading the RSSI register of the station with RAD ID = 2:
function code 04, start address 5001 (hex1389)
Data word
RAD-PT100-4-IFS
Pt 100 input
RAD-AO4-IFS
analog output
hex
dec / error code
-50°C ... +250°C
0 mA ... 20 mA
0 V ... 10 V
Possible cause
0000
0
-50°C
0 mA
0 V
7530
30000
+250°C
20 mA
10 V
7F00
32512
+275.12°C
21.67 mA
10.84 V
8001
Overrange
8002
Open circuit
Sensor wired incorrectly,
measuring line too long,
cable resistance too high
8080
Underrange
Address area
35001 ... 35250
Modbus function code
fc 04
Address
Wireless module
High byte
Low byte, RSSI value
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
35001
RSSI - RAD ID = 1
(master)
Reserved
X
X
X
X
X
X
X
X
35002
RSSI - RAD ID = 2
Reserved
X
X
X
X
X
X
X
X
...
...
Reserved
X
X
X
X
X
X
X
X
35250
RSSI - RAD ID = 250
Reserved
X
X
X
X
X
X
X
X
In PLC/Modbus RTU dual mode, the RSSI value is also within the register 35000 of each
wireless module, since each one has its own Modbus address.
Содержание RAD-900-DAIO6
Страница 16: ...RAD 900 14 138 PHOENIX CONTACT 3827_en_B...
Страница 58: ...RAD 900 56 138 PHOENIX CONTACT 3827_en_B...
Страница 94: ...RAD 900 92 138 PHOENIX CONTACT 3827_en_B...
Страница 98: ...RAD 900 96 138 PHOENIX CONTACT 3827_en_B...
Страница 116: ...RAD 900 114 138 PHOENIX CONTACT 3827_en_B...