Micromod MOD: Modcell 2050R MODBUS Communications - Manual (Page 34)

IB-23C650M
BASIC OPERATION WITH A HOST DEVICE
Computer Auto/Manual Station
When the controller and host device are configured to provide a
computer auto/manual function, the host performs the PID control
function. The results are communicated to the instrument and then to
the field. This activity is initiated by the host.
The displays and control key operation for a computer auto/manual
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 can be
disconnected by a coil when the
host initiates activity. This allows
the keys to be read by the host
which then initiates programmed
action.
This status display shows a
configured mnemonic indicating the
programmed action. Defaults are
CMP for automatic and MAN for
manual.
The R/L key permits selection of
any set-point enabled in the set-
points menu. This may be
disconnected by a coil so the R/L
key can be read by the host to
select set-points stored in the host.
The status display shows a
configurable mnemonic indicating
the set-point source. Defaults are:
LOC, LO2, LO3, LO4 and REM.
To check Modbus communication
status, press the scroll key to
access CMP. Status is indicated
as ENABLED or LOCKED. The
locked status is displayed after the
controller is switched to manual.
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