Type Conversion TO_INT not working

[jakefreese]

Expected Behavior

Should be able to convert ANY to INT
Attempting to convert a REAL to INT

It should convert ANY to INT

Current Behavior

Fails to compile

19-07-26 14:46:22]: Runtime compilation started: COMPILING

[19-07-26 14:46:23]: Generating C files...

[19-07-26 14:46:23]: ./st_files/webserver_program.st:846-34..846-35: error: ';' missing at the end of statement in ST statement.

[19-07-26 14:46:23]: ./st_files/webserver_program.st:846-35..846-39: error: invalid statement in ST statement.

[19-07-26 14:46:24]: 2 error(s) found. Bailing out!

[19-07-26 14:46:24]: Error generating C files

[19-07-26 14:46:25]: Compilation finished with errors!

[19-07-26 14:46:25]: Compilation failed (exit code: 1).

[19-07-26 14:46:25]: Failed to upload to Runtime v3.

19-07-26 14:46:26: Stopping compilation process.

Below snippet top line is 846

_TMP_TO_INT6913197_OUT := TO_INT(O_R);
SM_RTD0(STACK := SM_RTD0_STACK);
C_F1(Office_C_in := SM_RTD0.TEMP1, Garage_C_in := SM_RTD0.TEMP2, Exterior_C_in := SM_RTD0.TEMP3, RV_C_in := SM_RTD0.TEMP4, HVAC_Sup_C_in := SM_RTD0.TEMP5, HVAC_ret_C_in := SM_RTD0.TEMP6, HVAC_L_C_in := SM_RTD0.TEMP7, HVAC_V_C_in := SM_RTD0.TEMP8);
HVAC_FB0(HVAC_Office_zone_IN := HVAC_OFFICE_IN, HVAC_Office_zone_IN_V := HVAC_OFFICE_M_V, HVAC_Garage_zone_IN := HVAC_GARAGE_IN, HVAC_Garage_zone_IN_V := HVAC_GARAGE_M_V, HVAC_Heat_mode_IN := HVAC_HEAT_M, HVAC_Heat_mode_IN_V := HVAC_HEAT_M_V, HVAC_AC_mode_IN := HVAC_COOL_M, HVAC_AC_mode_IN_V := HVAC_COOL_M_V, Fan_mode := HVAC_FAN_M_V, Recirc_Mode := HVAC_RECIRC_M_V, Pan_SW := HVAC_PAN_SW, Office_T_DN := HVAC_OFFICE_TEMP_DN, Office_T_UP_1 := HVAC_OFFICE_TEMP_UP, Garage_T_UP := HVAC_GARAGE_TEMP_UP, Garage_T_DN := HVAC_GARAGE_TEMP_DN, Garage_Temp := GARAGE_TEMP, Office_Temp := OFFICE_TEMP);
O_R := C_F1.Office_F_out;
OFFICE_TEMP := _TMP_TO_INT6913197_OUT;

Possible Solution (Not obligatory)

Context

trying to convert some real values to int

Your Environment

• Version : Editor shows 4.2.6 under help/about, but should be 4.2.8 as verified downloaded latest on 7/19
• Operating System and version : Win11 latest

[thiagoralves]

This is caused by the library incompatibility between runtime v3 old compiler (MatIEC) and OpenPLC new compiler (STruC++). Things like that are expected to happen more frequently now with the gap between both worlds increasing. Runtime v3 is archived, but for the sake of keeping v4 compatibility we might push a patch to fix the conversion methods, making it similar to v4, which will fix this. However, the most recommended approach for your case is to definitely upgrade to runtime v4. Is there any specific reason that blocks your upgrade?

[jakefreese]

Why I am not able to upgrade to v4, Sequent.

If this is a legacy issue, I could make another library with a function block to handle this. Seems like adding work load to the developers for an issue that is in v3 that were moving away from. Ill see if I can get it to work with a function in a library.

Thanks!

[thiagoralves]

STruC++ still accepts SRC_TO_DST format, as this is the canonical IEC 61131-3 way of doing conversions. The simplified TO_DST conversion is a Codesys “feature” that we adopted for simplicity and compatibility with Codesys projects. In that case, you may be able to overcome this by creating a function in ST that internally calls the REAL_TO_INT() and it will be compiled just fine on both v3 and v4 runtimes. For example:

FUNCTION convert_to_int : INT
    VAR_INPUT
        input_real : REAL;
    END_VAR

    convert_to_int := REAL_TO_INT(input_real);
END_FUNCTION