Used the script in the message of the event's event configuration and it worked perfect...

My Transformation looks like this normally:

return $1/10;

(since the value returned is always 10x the actual voltage value)

But this always gives me a value of i.e. 23.500000

return format($1/10, 1, 1) gives the right value when I test it at transformation but not when the alarm is raised.

I tried Victor's solution of script:

Script Name: retvolt
Script Content: return format($event->parameters[1]/10, 1, 1);

At transformation I then put: return $[retvolt];

I get error: Error 34 in line 1: Function or operation argument is not a container

I assume I am calling the script the wrong way, but can't find examples of how to do it otherwise?
Please help.

You can format event parameter using script, like this:

1. use %[formatted_p4] instead of %4

2. Create script named formatted_p4 in library like this:

return format($event->parameters[4], 1, 2);

Best regards,
Victor