The document describes a new wireless temperature monitoring system. Temperature transmitters located throughout multiple plant areas transmit temperature readings wirelessly to a new wireless gateway system. The gateway collects the individual 4-20mA temperature signals and transmits them to the PLC, replacing the existing wired system. The wireless system uses multiple base units and transmitter groups to monitor temperatures across four plant areas.

1. Wireless Temperature
Transmitters located through out
the plant transmit temperatures
to the new wireless Gateway
system that provides individual Temperature
Transmitter
Temperature
Transmitter
Temperature
Transmitter
Temperature
Transmitter
4-20mA signals to the PLC Group 6 Group 8 Group 10 Group 12
Temperature Temperature Temperature Temperature
Transmitter Transmitter Transmitter Transmitter
Group 5 Group 7 Group 9 Group 11
Plant Area 2 Plant Area 3
Temperature Temperature Temperature Temperature
Transmitter Transmitter Transmitter Transmitter
Group 2 Group 4 Group 14 Group 16
Temperature Temperature Temperature Temperature
Transmitter Transmitter Transmitter Transmitter
Group 1 Group 3 Group 13 Group 15
Plant Area 1 Plant Area 4
Existing PLC New Wireless
MCC Gateway
Analog Analog Analog Analog
Transmitter Transmitter Transmitter Transmitter
Base Unit 1 Group 1 Group 2 Group 3 Group 4
Analog Input 1746-N18 Analog Input 1746-N18 Analog Input 1746-N18 Analog Input 1746-N18
16 4-20 mA signals
Analog I/O BUS Analog Analog Analog Analog
Transmitter Transmitter Transmitter Transmitter
Group 5 Group 6 Group 7 Group 8
Allen-Bradley Analog Input 1746-N18 Analog Input 1746-N18 Analog Input 1746-N18 Analog Input 1746-N18
PLC
16 4-20 mA signals
Analog Analog Analog Analog
Transmitter Transmitter Transmitter Transmitter
Base Unit 2 Group 9 Group 10 Group 11 Group 12
Analog Input 1746-N18 Analog Input 1746-N18 Analog Input 1746-N18 Analog Input 1746-N18
16 4-20 mA signals
Analog Analog Analog Analog
Analog I/O BUS Transmitter Transmitter Transmitter Transmitter
Group 13 Group 14 Group 15 Group 16
Analog Input 1746-N18 Analog Input 1746-N18 Analog Input 1746-N18 Analog Input 1746-N18
OleumTech 16 4-20 mA signals