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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:
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.
