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2.11 Control System
The Vertex M control system is a redundant system consisting of a central data acquisition
computer (DAq), a programmable logic controller (PLC) and one or more analyzer modules.
Figure 2-3. Communications Path
Above is a simplified block diagram of the communications path of the control system. The
analyzer modules and PLC are microprocessor controlled and contain non- volatile memory
2.11.1 Data Acquisition Computer
The data acquisition computer (DAq) is the central processor for the Vertex M system. It
configures the analyzers, stores data and provides a network interface for data transfer to other
computers. System display and operator control is through an LCD touchscreen w/ on-screen
keyboard or included external keyboard.
CAUTION
OPC on TCP/IP via Ethernet not recommended for alarm annunciation.
2.11.2 Programmable Logic Controller
The Programmable Logic Controller (PLC) is the control system path between the DAq and the
individual analyzers. The PLC polls the analyzers for current information, activates relays which
may be connected to external alarms and provides external communications.
Vertex M
32
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