Micromod MOD: 30ML Installation - Manual (Page 13)

MOD 30ML Multiloop Controller
PRODUCT DESCRIPTION
1.3 BASIC HARDWARE
1.3.1 MOD 30ML MULTILOOP CONTROLLER
The 1800R, Figure 1-1, is designed for mounting in a panel with a 15.75-inch depth. The
instrument housing contains a termination facility accepting all instrument I/O,
communications, and power connections. This assembly is designed to allow termination
signal entry from either top or bottom, allowing for flexibility in signal separation for wiring
considerations. The instrument connects to the terminals via an edge connector at the back
of the carrier board, permitting interchangeability without disconnecting field wiring.
The 1801R has a narrowed display bezel for installations where horizontal spacing is an
issue.
The 1803R split-architecture model allows the display to be remotely mounted (up to 8 ft/243
cm) from the remainder of the controller.
The carrier board provides the connection locations for the modular I/O. There are eleven
locations for single width I/O modules. Ten of the locations are arranged in pairs to accept as
many as five double-width modules. The carrier board also contains the built-in I/O and
communications circuits. Two direct connected analog inputs accept thermocouple, RTD,
millivolt and volt dc, milliamp dc and resistance inputs. A 24V dc transmitter power supply for
2-wire transmitters is available on both inputs. Two outputs provide either a 20 mA dc signal
or a 50 mA dc signal. The built-in communications circuits terminate in five multi-purpose
terminals permitting connection to any of the following networks: ICN, RS-232 Modbus, and
2-wire or 4-wire RS-485 Modbus.
The instrument CPU is a 16MHZ 68302 microprocessor. An identity module (1800P)
provides the functionality that gives the instrument the capability to execute a user-configured
database. The CPU supports 64K bytes of nonvolatile RAM for database storage, and a
time-of-day clock with battery support. A high speed communications channel is used
between the CPU and both the built-in I/O and any I/O modules installed on the instrument.
The CPU board provides for connection of an optional plug-in memory module.
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