Servomex 07931001B, Operator'S Manual

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© Servomex Group Limited. 2020 07931001B revision 6
Auto validation is accessed through Modbus. This is not a secure interface and
there is no easy way of making it properly secure. However, in order to provide a
basic level of access control to auto validation, it is necessary to enter an access
code before running auto validation.
The access code is a number between 0 and 999999 and the value is equal to the
operator password currently set for the Laser 3 Plus in question.
Once the access code has been sent, it remains active until a complete run of auto
validation has happened. Once auto val completes, access is removed until the
access code is entered again. Aborting auto validation part way through will also
clear the access code.
You can also read back on Modbus whether the correct passcode has been
received by the Laser 3 Plus for the measurement in question. If the register returns
1 then the correct passcode has been received for that measurement and auto val
will be allowed to start when commanded. If the address returns 0 then the correct
passcode has not been received and auto val will not be allowed to start.
The registers are
•
Auto Validation Pass Code
•
Correct password received
Refer to the Modbus map in section 12.1.14 for the register address.
Note that although this has been put as step 2, it is in fact entirely optional. Note
also that you don’t have
to input the access code to edit the validation parameters.
They can be edited at any time.
Things to note:
1. As long as you edit the parameters before starting auto validation, the values
you enter will be used in the next run of auto validation.
2. The parameters are saved in non-volatile memory, so they are preserved
across power cycles.
3.
If you don’t edit the
parameters, then the currently saved values will be used.
4. There is one set of parameters per measurement. So e.g. on a CO+CH4
there is one set of parameters for CO and one set for CH4. Choose the
appropriate Modbus register block for the measurement that you wish to edit.
5. The parameters are common with manual validation, so anything you edit for
auto val will also affect manual val and vice versa.
Guidance on setting the various parameters is given in the table below: