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1.1.
Profile
850
Operator Interface
Large backlit LCD screen with high visibility and high con-
trast. Two to three rows on the screen display variables,
setpoints and alphanumerical information, scrolling up to
75 configurable messages of 32 characters each in three
different languages. The selection of languages and easily
comprehensible scrolling texts regarding diagnostics, alar-
ms, and process statuses ensure that the controllers speak
the users' language.
Control
One or two PID control loops with two universal inputs con-
figurable for thermocouples, thermoresistances and linear
inputs. They may be used independently to manage two dif-
ferent forms of control or they may interact with cascade or
ratio control. An optional third linear analogue input may be
used to acquire signals such as remote setpoints or retro-
active valve feedback, while also supplying the necessary
potentiometer power supply.
If the appropriate four-point calibration is performed in the
field, the controller meets the requirements of standard AM-
S2750E and may be used in applications requiring the NA-
DCAP directive.
Easy Configuration
Set-up wizard for manual-free programming with only a few
indispensable parameters, commented by online help mes-
sages. Opportunity to create your own password-protected
"User menu" containing only the parameters required for the
application.
Advanced set-up and work recipe creation can be achieved
via PC and GF_eXpress software, even without powering
the controllers. GF_eXpress may be used to define, for each
menu and parameter, which values will be shown to the con-
troller to ensure easy use in the field.
Controllers can still be configured directly in the field using
only four keys, associated with led lights that provide fee-
1.
GENERAL DESCRIPTION
1650
80209C_MHW_850-1650-1850_20-2020_ENG_pag. 10
dback when a button is pressed and guide the user by indi-
cating the appropriate operations. Factory settings can be
restored if necessary, either on the keyboard or using the
GF_eXpress software tool. Diagnostics, preventive mainte-
nance and consumption monitoring.
Exhaustive diagnostics for breakage or incorrect connection
of probes, total or partial load breakdown, off-scale variables
and anomalies in the control ring. Counters for the number of
relay and comparator switches, with alarm thresholds, per-
mit scheduling of preventive maintenance to replace worn
actuators. Two internal energy counters with alarms for ano-
malous variations count total energy consumption in kWh
and its cost, permitting ongoing energy monitoring.
Diagnostics, preventive maintenance and consumption
monitoring.
Exhaustive diagnostics in the event of breakage or incorrect
connection of probes, total or partial breakage of the load,
off-scale variables and anomalies in the adjustment ring.
Relay switch counters and comparators with alarm signals
permit planning of preventive maintenance work for replace-
ment of worn actuators. Two internal energy counters with
alarms for signalling anomalous variations totalise energy
consumption in kWh and its cost, permitting uninterrupted
energy monitoring.
Functional application blocks
Thirty-two logical AND, OR, Flip-Flop, Comparator, Counter
and Timer Function Blocks permit creation of customised lo-
gical sequences for complete, flexible machine control. Eight
mathematical Function Blocks permit processing of analo-
gue variables and calculation of differences, sums, multipli-
cation and division, averages, top and bottom values, square
root calculation and logarithms. Function Blocks also permit
management of 8+8 additional inputs/outputs available for
models 1850 ¼ DIN.
1850
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