NOVUS AUTOMATION
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M.Coil
Modbus-Coil
The output will act as a Modbus-Coil command for connection to the Modbus-TCP protocol.
Table 2 –
Function types for analog outputs
You can add more outputs to the device by adding more modules (see
section).
4.2.3
ALARM CONFIGURATION
N20K48 Modular Controller
has 4 independent alarms (
CFG
>>
ALM
>>
Fu.A1
,
Fu.A2
,
Fu.A3
or
Fu.A4
), which can be configured to operate
with the following functions:
SCREEN
FUNCTION
ACTION
off
Disabled
The alarm is off.
Lo
Minimum Value Alarm
(
Lo
w
)
SPAn
PV
Hi
Maximum Value Alarm
(
Hi
gh
)
SPAn
PV
DiF
Differential Value Alarm
(
Dif
ferential
)
SV
PV
SV + SPAn
SV - SPAn
Positive SPAn
SV
PV
SV - SPAn
SV + SPAn
Negative SPAn
diF.L
Differential Minimum Value
Alarm
(
Dif
ferential
L
ow
)
Positive SPAn
SV
PV
SV - SPAn
Negative SPAn
SV
PV
SV - SPAn
DiF.H
Differential Maximum Value
Alarm
(
Dif
ferential
H
igh
)
Positive SPAn
SV
PV
SV + SPAn
Negative SPAn
i.Err
Input Error
(
i
nput
Err
or
)
Function to detect input errors, although not all admitted input error can be identified by this function.
See section
This option and the
Initial Alarm Block
function are mutually exclusive. You cannot set an initial block
if you set up an alarm as Open Sensor Alarm.
rs
Event Alarm
(
r
amp and
S
oak
)
The alarm must be triggered in specific segments of the Ramps and Soaks programs to be created.
See
chapter.
End.t
End of Soak
(
End of Level
)
End of Ramp to Soak program time. Allows the controller to go into alarm upon reaching the set Ramp
to Soak time.
Lbd
Loop Break Detection
Allows you to set the selected channel as output for the Loop Break Detector function.
Table 3 –
Alarm functions
In the above examples, the term SPAn refers to the following Alarm Setpoints:
SP.A1
,
SP.A2
,
SP.A3
and
SP.A4
.
Alarms configured with
Hi
,
Dif
and
Dif.H
functions also trigger the related output when the controller identifies a sensor failure. A relay output, for
example, configured to behave as a Maximum Alarm (
Hi
), will act when the SPAL value is exceeded and when the sensor connected to the controller
input breaks.
If no control output is used, both outputs can be set as alarms (see
section).
4.2.3.1
INPUT ERROR TYPES
The
Input Error
function cannot identify all types of errors. A short-circuit in the 0-5 V input signal, for example, will be identified by the device as a
0 V signal applied to the input and thus will be recognized as a valid value. In such situations, you should analyze each case.
The table below shows the behavior of the controller when facing possible failures allowed for the various types of input:
INPUT TYPE
PROBLEM
PROBLEM DESCRIPTION
Thermocouple
Open or broken
thermocouple
The error will be recognized by the
Input Error
function. In its display, the device
will show the
UUUU
message.
Short Circuit
The error will
not
be recognized by the
Input Error
function. In its display, the
device will show the temperature value of its rear terminals (Cold Junction
temperature).
Pt100
Broken wires
The error will be recognized by the
Input Error
function. In its display, the device
will show the
----
message.
Short Circuit
The error will be recognized by the
Input Error
function. In its display, the device
will show the
UUUU
message.
0-20 mA
Broken or short-circuited
wiring
The error will
not
be recognized by the
Input Error
function. In its display, the
equipment will show the lower value of the configured range.
4-20 mA
Broken or short-circuited
wiring
The error will be recognized by the
Input Error
function. In its display, the device
will show the
----
message.
SV
PV
SV + SPAn