Micromod MOD: Modcell 2050R MODBUS Communications User Manual

Page 33

IB-23C650M

BASIC OPERATION WITH A HOST DEVICE

Supervisory Station
When the controller and host device are configured to provide a
supervisory function, the controller receives its set-point from the host
device. The controller executes its PID algorithm in the normal manner,
and in general functions the same as a standard controller. This activity
is initiated by the host.

The displays and control key operation for a supervisory station are as
follows:

Tag display can be configured to
indicate that the host has initiated
activity. Default indication is
COMPUTER.

The auto and manual keys perform
their normal function.

This status display shows a
configured mnemonic when the
host initializes activity. The default
is CMP. For supervisory operation,
the display can be configured to
show AUT to indicate that the PID
function still resides in the
controller.

The R/L key can be disconnected
by a coil when the host initializes
activity. This allows the key to be
read by the host to select multiple
set-points stored in the host.

The status display shows a
configurable mnemonic indicating
which host set-point is being
written to the controller. Defaults
are: LOC, LO2, LO3, LO4 and
REM.

To check the Modbus
communication status, press the
scroll key to access CMP. Status
is indicated as ENABLED or
LOCKED.