Honeywell Vertex M User Manual page 199

If the concentration is non-zero and a fault exists, the concentration value will take priority and
be reported. It is not possible to detect the existence of maintenance faults from the
concentration outputs.
The full-scale value of the concentration output is equal to the full- scale value of the gas table
by default.
See "Configure Point" on page 60 for more information.
If the concentration data is to be used only for visualization and datalogging, it may be more
convenient to capture this information through OPC. See "OLE for Process Control (OPC)
Interface" on page 191 for more information. This avoids the requirement of scaling the value
to get actual concentration. The concentration is available through the highly-reliable fieldbus
for those customers who wish to make shutdown decisions based on concentrations instead of
alarm levels.
Heartbeat
A heartbeat counter is provided with some of the fieldbusses in word 40. This increments every
second to confirm that the internal PLC is running and that communications is working.
External equipment communicating with the Vertex M via Ethernet/CIP, LonWorks or Profibus
must verify that this value is changing to be certain that the PLC is operating.
Each optional fieldbus interface is implemented using commercial communications modules
connected to the internal PLC. In the Vertex M the modules function as slaves only, although
the hardware may be capable of acting as scanners or masters when installed elsewhere.
Vertex M
Figure 8-1. Configuration Profile
Figure 8-2. Configuration Profile
199 User Manual