Automatic control function programming manual ladder language

Valid Function Calls:
- Var_1.L = printf(STRING_1, %M45.W 8 + Var_4 * Var_5 which generates the following stack is rejected
by the compiler because it requires more than five registers for its evaluation.
Var_1 register 1
Var_2 register 2
Var_3 register 3
8 register 4
Var_4 register 5
Var_5 register 6 *error, more than 5 registers
* register 5
+ register 4
>> register 3
^ register 2
| register 1
The above expression can be evaluated by reorganising it. The equivalent expression Var_3 >> Var_5 * Var_4 + 8
^ Var_2 | Var_1 which generates the following stack is accepted by the compiler.
Var_3 register 1
Var_5 register 2
Var_4 register 3
* register 2
8 register 3
+ register 2
>> register 1
Var_2 register 2
^ register 1
Var_1 register 2
| register 1
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