ADDRESS_OF_CONSTANT

Severity: warn

ADR(c) where c is a VAR_GLOBAL CONSTANT.

Why it matters. A CONSTANT may live in flash / read-only storage on some runtimes; dereferencing a pointer derived from it can fault. Even when it works today, the pointer's value isn't actually mutable.

Settings. No check-specific config.

Trigger.

VAR_GLOBAL CONSTANT
    cMax : INT := 100;
END_VAR

pMax := ADR(cMax);                 (* fires *)

The bot posts.

🟧 warn  ADDRESS_OF_CONSTANT
ADR(cMax), taking the address of a CONSTANT
A CONSTANT may live in flash/read-only storage on some runtimes;
dereferencing a pointer derived from it can fault.

Fix. If you need a mutable copy, declare a regular VAR_GLOBAL initialised to the constant value.