IDE Textual coding: Error writing PLC variables with datalayer.write() (INT, REAL)

While docu says that simple data types (Integers, Reals, Strings, Bool) are supported, I think it is either a bug in the function or the documentation.

There is another function to write datalayer items with the name: datalayer.write_json(). I attached example code:

PLC variables (SINT, DINT, LINT, USINT, UINT, ULINT, REAL, LINT, BOOL, STRING, WSTRING,...)

python example

function dlWrite where you must provide the type of datalayer variable (more performant than dlWrite2 but more effort to use it)
function dlWrite2 where the type of datalayer variable is automatically read (less performant, but easier to use)
Read & write complete array values
Python example

import sys
import json

# define item names with place holders
sArIntItem = "/plc/app/Application/sym/GVL/arInt[{}]"
sArLIntItem = "/plc/app/Application/sym/GVL/arLInt[{}]"
sArStrItem = "/plc/app/Application/sym/GVL/arStr[{}]"
sArRealItem = "/plc/app/Application/sym/GVL/arReal[{}]"

sArrItem = sArRealItem.format(1)  # create array item name
datalayer.write(sArrItem, 1.2)

def dlWrite(sVar, sType, oVal):
    # write datalayer variable, type must be provided
    if type(oVal) is str:
        # use write to avoid problems when string contains special characters like {}"'
        datalayer.write(sVar, oVal)
    else:
        datalayer.write_json(sVar, f'{{"type": "{sType}", "value": {oVal}}}')


def dlWrite2(sVar, oVal):
    # write datalayer variable, type is read
    sRead = datalayer.read_json(sVar)
    jRead = json.loads(sRead)
    sType = jRead["type"]
    if (sType == "string"):
        # use write to avoid problems when string contains special characters like {}"'
        datalayer.write(sVar, oVal) 
    else:
        datalayer.write_json(sVar, f'{{"type": "{sType}", "value": {oVal}}}')


for i in range(10):
    # loop over array item
    # manipulate single int array items
    sArrItem = sArIntItem.format(i)  # create array item name
    iVal = datalayer.read(sArrItem)
    iVal += 10
    # writeDL(sArrItem, "int16", iVal)
    dlWrite2(sArrItem, iVal)

    # manipulate single string array items
    sArrItem = sArStrItem.format(i)  # create array item name
    sVal = datalayer.read(sArrItem)
    sVal += "{'"
    dlWrite2(sArrItem, sVal) 

# Read complete array
sArrayLInt = sArLIntItem.replace("[{}]", "")
sRead = datalayer.read_json(sArrayLInt)
jRead = json.loads(sRead)
sType = jRead["type"]
arLInt = jRead["value"]

# manipulate array values
iLen = len(arLInt)
for iID in range(0, iLen):
    arLInt[iID] += 10

# Write complete array
datalayer.write_json(sArrayLInt, json.dumps(jRead))
sys.exit(0)

PLC example

{attribute 'symbol' := 'readwrite'}
{attribute 'linkalways'} // export unused variables into symbol file
VAR_GLOBAL
  arStr:   ARRAY[0..9] OF STRING;  // string
  arWStr:  ARRAY[0..9] OF WSTRING; // string
  
  arBool:  ARRAY[0..9] OF BOOL;    // bool8

  arSInt:  ARRAY[0..9] OF SINT;    // int8
  arInt:   ARRAY[0..9] OF INT;     // int16
  arDInt:  ARRAY[0..9] OF DINT;    // int32
  arLInt:  ARRAY[0..9] OF LINT;    // int64

  arUSInt: ARRAY[0..9] OF USINT;   // uint8 
  arUInt:  ARRAY[0..9] OF UINT;    // uint16
  arUDInt: ARRAY[0..9] OF UDINT;   // uint32
  arULInt: ARRAY[0..9] OF ULINT;   // uint64

  arReal:  ARRAY[0..9] OF REAL;    // float
  arLReal: ARRAY[0..9] OF LREAL;   // double
END_VAR

IDE Textual coding: Error writing PLC variables with datalayer.write() (INT, REAL)

Python example

PLC example