Table of Contents
Advertisement
2 Description
For this, the following parameters are converted when shown on the display:
•
Measured value
•
Scaling start/end, offset
•
Setpoint values, setpoint limits, switching differentials, proportional band
•
Limit values, switching differential
•
Tolerance band
If the parameter is configured to "none", the icons for °C and °F are hidden on the display. (purely for
timer applications).
For all variables for which the unit is clearly a temperature, this is known to the firmware. There is no
configuration setting. For variables that the device is unable to clearly assign as a temperature value,
the unit is set by a "temperature none/relative/absolute" configuration parameter.
The device always selects the correct, appropriate unit for showing the measured value on the display.
2.9
Limit value monitoring
This function can be used to monitor any analog signal with different switching functions. All in all, there
are 8 alarm functions (AF) with different switching characteristics stored on the device.
The switching functions are split into:
•
Setpoint-related switching functions (limit value based on the setpoint)
•
Limit-value-related switching functions (absolute limit value)
For the limit value monitoring function, the following additional functions are also available:
Switch on/off delay
Pulse function
Startup alarm suppression
16
•
After the AF event has occurred, the switch-on delay starts to
elapse; the AF output remains unchanged
•
After the switch-on delay has elapsed, the AF event is passed on
to the AF output
•
If the AF actual value goes out of the "invalid range" during this de-
lay time, the time countdown restarts each time the value goes be-
yond the limit value
•
Switch-off delay (behavior similar to switch-on delay)
•
The AF output is automatically reset if the value goes beyond the
limit value after the set pulse time
•
If the AF actual value goes into the "valid range" during this time,
the pulse time is reset
•
The pulse function has priority over the switch-off delay; a pro-
grammed switch-off delay has no effect
OFF
The alarm function is always active. The limit value ex-
ceedance is also immediately transmitted to the output
signal in the switch-on phase or in the event of parameter
changes
ON
The AF output only becomes active when the "valid
range" has been reached for the first time. If, for example,
the setpoint value is changed or the device is switched
on, the limit value exceedance is not transmitted to the
output signal.
Advertisement
Table of Contents
Troubleshooting
