Section 3.0 Wiring
3.1 General
The 56 is easy to wire. It includes removable connectors and slide-out signal input boards
The front panel is hinged at the bottom. The panel swings down for easy access to the wiring
locations.
3.1.1 Removable connectors and signal input boards
The 56 uses removable signal input boards and communication boards for ease of wiring and
installation. Each of the signal input boards can be partially or completely removed from the
enclosure for wiring. The 56 has three slots for placement of up to two signal input boards
and one communication board
3.1.2 Signal input boards
Slots 2 and 3 are for signal input measurement boards. Wire the sensor leads to the
measurement board following the lead locations marked on the board. After wiring the sensor
leads to the signal board, carefully slide the wired board fully into the enclosure slot and take up
the excess sensor cable through the cable gland. Tighten the cable gland nut to secure the cable
and ensure a sealed enclosure.
NOTE:
For the purpose of replacing factory-installed signal input boards, Rosemount
®
Analytical Inc. is the
sole supplier.
3.1.3 Digital communications
HART
®
digital communications is standard on 56. HART
®
versions 5 and 7 are available on the
56 and can be switched using the local keypad. A Profibus DP communication board is
available as options for 56 communication with a host. HART communications supports Bell
202 digital communications over an analog 4-20 mA current output. Profibus DP is an open
communications protocol which operates over a dedicated digital line to the host.
3.1.4 Alarm relays
Four alarm relays are supplied with the switching power supply (85 to 264 VAC, -03 order
code) and the 24 VDC power supply (20-30 VDC, -02 order code). All relays can be used for
process measurement(s) or temperature. Any relay can be configured as a fault alarm instead
of a process alarm. Each relay can be configured independently and each can be
programmed as an interval timer, typically used to activate pumps or control valves. As
process alarms, alarm logic (high or low activation or USP*) and deadband are user-
programmable. Customer-defined failsafe operation is supported as a programmable menu
function to allow all relays to be energized or not-energized as a default condition upon
powering the analyzer. The USP* alarm can be programmed to activate when the
conductivity is within a user-selectable percentage of the limit. USP alarming is available only
when a contacting conductivity measurement board is installed.
Slot 1-Left Slot 2 – Center Slot 3 – Right
Profi board Signal Board 1 Signal Board 2
Wiring 21
Instruction Manual Section 3: Wiring
LIQ-MAN-56 April 2017
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