The Field Communication Unit (FCU) is a data concentrator that continuously polls data from field devices such as Radar Tank Gauges, Data Acquisition Units and Remote Display Units and stores them in a buffer memory. Whenever a request for data is received, the FCU can immediately send data from a group of tanks from the updated buffer memory.
The FCU acts as a slave on the group bus and as a master on the field bus. The unit has six communication ports. The ports can be individually configured as either group bus ports or as field bus ports.
There are three possibilities:
1. 4 field bus ports, 2 group bus ports.
2. 3 field bus ports, 3 group bus ports.
3. 2 field bus ports, 4 group bus ports.
Each field bus can connect maximum 16 devices
(however max. 8 are recommended).
Technical Data
Explosion protection:
None.
Ambient operating temperature:
-40 to +70 °C (-40 to +158 °F).
Power supply:
115 or 230 VAC, +10% to -15%, 50-60 Hz, max. 10 W.
Ingress protection:
IP 65.
Group bus ports:
TRL/2 Bus, RS232, RS485 and a Modbus based protocol.
Group bus baudrate:
Programmable up to 19200.
Field bus ports:
TRL/2 Bus and a Modbus based protocol.
Number of RTG:s per field bus port:
Max 8 is recommended.
Number of tanks per FCU:
Max 32 (max. 8 per field bus is recommended).