Operation Locks
An operation lock is a shared password asked for before a value is written to a variable. It is there to make accidentally driving a critical output — a breaker, a valve, a motor — harder.
Fields
Section titled “Fields”| Field | Description |
|---|---|
| Name | The lock’s name, max 100 characters |
| Dsc | Description, max 255 characters |
| Write Password | The password asked for on a write |
The password is stored encrypted and not shown back; leaving it empty while editing keeps the existing one.
Using one
Section titled “Using one”A lock is defined here and then attached to the variable itself. From then on, every write to that variable asks for the password to be supplied with it.
One lock can be attached to several variables: the same password then protects a group of critical outputs.
Not the same as an electronic signature
Section titled “Not the same as an electronic signature”The two can be used together, but they answer different questions:
| Operation lock | Electronic signature | |
|---|---|---|
| Whose password | Shared — configured on the variable | The person’s own account password |
| What it proves | That the writer knew the password | Who wrote it |
| In the audit trail | Says nothing about identity | Fills the signature field |
| If refused | The write does not happen | The write does not happen, and the device is never reached |
An operation lock answers “is this write allowed?”; a signature answers “who approved it?”. A lock password says nothing at all about who typed it.
Related
Section titled “Related”- Variables — where a lock is attached
- Control Panel — writing a value