gefran ILI Series Original Operating Instructions page 25

7.8. Relay Threshold change – only for SIL 2 / PL d relay output version –
The IL transducer has an optional relay output contact on pin 2 and 5 of M12 connector (only for SIL 2 / PL d relay output version).
This contact can be used as Safety function for safety related application up to SIL 2 / PL d.
The relay contact is normally closed during standard working of the transducer.
It opens due to one of the following causes:
• The input pressure goes above a determined threshold
• An internal error, related to safety function, happens
If the pressure goes below the threshold (plus hysteresis) the relay contact closes again
If an internal error happens (for SIL 2 / PL d versions), the device blocks its function until a power cycle is made and the error cause
removed.
The threshold at which the relay contact will open is selected through ordering code.
During IO-Link parameterization, only with Specialist or Maintenance credentials, it is possible to change the threshold through the
following procedure:
1) Write the new desired value in %FS at Index 0x200 subindex 0 (values accepted between 10 and 100 % FS)
2) An event of "Event for Relay Threshold Changed, required confirmation" (0x18A1) is launched by the Device
3) Within 30s from writing of new value a Sys Command of "Relay Threshold Confirmation" (value 0xA2) must be launched
4) If the procedure worked fine an event of "Event for Relay Threshold Changed, value confirmed" (0x18A2) is launched by the
Device
5) Read back the new value changed and confirmed at Index 0x0106 Subindex 0 (Relay Activation Threshold)
6) From now on the new threshold is saved and used
7) If:
a) The procedure stops for any reason
b) The confirmation command is not launched within 30s
The new value is rejected and the old one restored.
Action on this parameter must be done by skilled and trained personnel only.
7.9. Damping filter parameter
The Process Value, represented by both analog output pressure (where available) and IO-Link pressure data, can be filtered by a
digital filter with the aim of smoothing the output value in front of noise and peaks on input value.
The time duration of this filter is driven by the Damping Filter parameter (see par. 7.4 – Device parameters - index 0x0120); its value
is expressed in seconds and represents the step response time from 10% to 90% of step value.
This filter applies both to analog output and IO-Link digital value.
The value of Damping Filter can be changed under these constraints:
• It can be modified only by Specialist and Maintenance users
• It is limited in the range 2 ms ... 1s
Writing of this parameter has immediate effect on output.
Modification of this parameter must take into account that it will add delay to the response time of Safety function, both for analog and
relay ouput. For this reason Action on this parameter must be done by skilled and trained personnel.
7.10. Autozero command
The Autozero command (see par.7.4, Table 5 – System command values – value 0xA0) allows the user to put to zero the offset of
pressure reading of transducer due to thermal drift at working temperature, as described in calibration procedure at par 5.2
Action on this command must be done by skilled and trained personnel, under these constraints and procedure:
• It can be acted only by Specialist and Maintenance users
• It is limited in range according to Table 6
• It must be acted at 0 barg pressure in the plant
• It cannot be acted at a time interval shorter than 20 s
• After the application of command the user shall verify the output, both analog (if available) and IO-Link, in order to confirm that
the pressure offset has gone to zero.
• Writing of this parameter has immediate effect on output.
Application of command has immediate effect on output.
The value of offset measured and stored by the device is visible at parameter AutozeroCorrection (see par. 7.4, - Device parameters
– Extended index – index 0x0116).
With Specialist and Maintenance credentials the Autozero effect can be cancelled (reset) through the Autozero Reset command (see
par. 7.4, Table 5 – System command values – value 0xA1).
With Specialist and Maintenance credentials The Autozero effect can also be disabled through the UseAutozeroCorrection parameter
(see par. 7.4, - Device parameters – Extended index – index 0x0108).
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