Detcon 700 Foundation Fieldbus Bridge - Manual (Page 5)

Foundation Fieldbus Bridge
700 Sensor FF Bridge IM Rev. 0.0 Page 1 of 8
1.0 Description
The Foundation Fieldbus Bridge is a bi-directional digital communication interface that provides data
communication between the Model 700 sensors and Foundation Fieldbus enabled devices. The open,
nonproprietary Foundation Fieldbus architecture provides a communications protocol for control and
instrumentation systems in which each device has its' own "intelligence" and communicates via an all-digital,
serial, two-way communications system.
Figure 1
Foundation Fieldbus Bridge PCA
The Foundation Fieldbus Bridge supports the Foundation H1 protocol. The H1 protocol runs at 31.25kbits/s
and is intended to operate over twisted pair instrument cable. The Foundation Fieldbus Bridge communicates
with the Model 700 sensors via its Modbus™ interface and transfers that information to the Foundation
Fieldbus. This enables a Foundation Fieldbus master to read four primary variables from the 700 series sensor.
These variables include:
 Measured gas concentration
 Sensor fault status
 Input voltage
 Temperature