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Section 3: The Genesis System—Overview
The TraceNet Genesis system modules include a Human Machine Interface, or
HMI
; at least
one (1) Distributed Control Module, or
DCM
; at least one (1) Distributed Temperature
Module, or
DTM
; and at least one (1) Input-Output Module, or
IOM
.
3.1: Genesis Modules Overview
3.1.1 The HMI Module
The
HMI
(Human Machine Interface) serves as the central monitoring and interrogation
point for a TraceNet Genesis control & monitoring system. It allows the operator to
access operating control parameters and operating conditions throughout the heat
tracing system network. The
HMI
communicates directly with other Genesis modules
through CAN bus and with a DCS or host PC for TraceNet Command through Ethernet.
HMI
3.1.2: The DCM
The
DCM
(Distributed Control Module) provides control output to solid state and/or
mechanical relays as well as heater current and earth leakage current measurement for up
to six (6) EHT heaters/circuits. LEDs indicate output status for each circuit.
Every panel will have one (1)
DCM
for each six (6) individually controlled
relays as identified by its six (6) sub-addresses to represent six (6) specific
individual heaters. (Multiple heaters can be connected in parallel to
a common control relay, but the Genesis
HMI
will not be able to
distinguish individual circuit segments from a common control
relay.)
3.1.3: The DTM
The
DTM
(Distributed Temperature Module) is a DIN rail mountable six RTD sensor input module and provides
input for up to six (6) RTD sensors. Any RTD sensor may be mapped to any heater circuit on the CAN Bus network. A single
RTD sensor can provide temperature information for an entire Genesis panel (i.e. ambient sensing). Because individual
EHT circuits can have multiple sensors (up to twenty (20) RTD sensors per heater), the
total number of
DTM
cards per panel can vary by system. Refer to the project specific
drawings for each panel.
Every panel will have at least one (1)
DTM
which can receive inputs from up to six (6)
individually identified RTD temperature sensors. The
DTM
has six (6) sub-addresses to
distinguish each of up to six (6) individual sensors.
•
For an Ambient Sensing Control Panel, a single RTD sensor can provide input for the
entire panel. In this case, there is a single
DTM
for that panel.
•
For Line-Sensing Control, at least one (1) RTD sensor per control relay is provided, and
the number of
DTM's
will match the number of
DCM's
.
•
"RTD Mapping” is required to monitor multiple RTD temperature sensors for a common
heater. Up to twenty (20) RTD sensors can be assigned to a heated line or surface, in which
case there could be more
DTM
's than
DCM'
s.
DCM With Solid State Relays
Mounted On Heat Sink
DCM
DTM
