Thermo Scientific LevelPRO Series, Installation Manual

Page: 37 / 111

Wiring
Foundation Fieldbus Communications
Thermo Fisher Scientific LevelPRO Installation Guide
4-9
With F
OUNDATION
fieldbus, the gauge provides users with access to
control or program parameters via a host system. The fieldbus connector is
accessible from the faceplate of the LevelPRO, and the only connections
required for operation are to the H1 bus.
Refer to the LevelPRO with F
OUNDATION
fieldbus application guide for
specific wiring instructions.
The contact closure inputs are dry contact inputs between ground and
Switch 1 and ground and Switch 2 at J13 on the CPU board. The gauge
can be configured via software settings to execute a command or other
function upon a user-provided contact opening or closing. Refer to the
LevelPRO user manual for instructions on assigning commands to the
contact closure inputs.
When operating in “cascade” mode, where multiple units are wired
together to act as a single detector, contact closure Switch 2 is dedicated to
performing the cascading function. Refer to drawings 868503 and 868529 .
Following are the configurations available for the 4–20 mA current output:

Isolated, loop-powered (default)

Non-isolated, self-powered

Isolated, self-powered output (requires optional piggyback board p/n
886595)
The isolated, loop-powered or non-isolated, self-powered configurations
can drive an 800 ohm maximum load over the full current output range.
The isolated, self-powered current output can drive a maximum load of
1000 ohms. The current output is programmable between 3.8 and 20.5
mA. The fault low condition for the current output is 3.6 mA or less, and
the fault high condition is 20.8 mA or greater.
F
OUNDATION
Fieldbus
Communications
Contact Closure
Inputs
Current Output