Technical Specifications

215
Device Operational States and
Foundation Fieldbus
The Heat Exchanger Reference Model segment consists of a Heat Exchanger Host in a
control center with a Foundation Fieldbus trunk connected to two junction boxes. One
junction box has spurs to the flow and temperature control devices and the other
connects to the devices controlling tank level. A power supply with isolation electronics
and two terminators completes the configuration. Configure the ValVueFF maintenance
computer interface cards (NIFBUS) so as to not interfere with the Heat Exchanger Host.
CAUTION Never connect a ValVueFF PC to an operating segment
unless it is configured as a Basic Device. See Figure 175 to
view the configuration options.
Do not cause a short circuit in a working segment while
connecting or disconnecting any device.
Device Operational States and Block Modes
The Operation State can be accessed several ways:
❑ From the Device Selection frame, right-click the device to pop up a menu list and
select Device Operation State.
❑ Select the icon.
❑ Select Tools > Device Operation State from the Menu bar.
The Device Operation Dialog appears (Figure 179) and offers a choice of Out Of
Service, Manual or Normal (Automatic) states.
Figure 179 Device Operation State Dialog Box