Filter
Top Products
Reference Manual
00809-0400-4728, Rev AA
June 2011
A-5
Rosemount 644
Turn-on Time
Performance within specifications in less than 20 seconds after power is
applied, when damping value is set to 0 seconds.
Status
If self-diagnostics detect a sensor burnout or a transmitter failure, the status of
the measurement will be updated accordingly. Status may also send the PID
output to a safe value.
Power Supply
Powered over F
OUNDATION fieldbus with standard fieldbus power supplies.
The transmitter operates between 9.0 and 32.0 Vdc, 11 mA maximum. The
power terminals are rated to 42.4 Vdc max.
Alarms
The AI function block allows the user to configure the alarms to HI-HI, HI, LO,
or LO-LO with a variety of priority levels and hysteresis settings.
Backup Link Active Scheduler (LAS)
The transmitter is classified as a device link master, which means it can
function as a Link Active Scheduler (LAS) if the current link master device fails
or is removed from the segment.
The host or other configuration tool is used to download the schedule for the
application to the link master device. In the absence of a primary link master,
the transmitter will claim the LAS and provide permanent control for the H1
segment.
F
OUNDATION fieldbus Parameters
Software Upgrade in the Field
Software for the 644 with F
OUNDATION fieldbus will be easy to upgrade in the
field. Users will be able to take advantage of software enhancements by
loading new application software into the device memory.
Schedule Entries 25
(1)
(1) Minimum quantity.
Links 16
(1)
Virtual Communications Relationships (VCR) 12
(1)