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    my $itemdata = OPCItemRead ($rightdata[0], $i+1);
    $rightdata[0]->{lastvalues}->[$i] = $itemdata->{Value};
    OPCItemWrite($rightdata[0], $i+1, $rightdata[0]->{lastvalues}->[$i
+] + 1);

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sub OPCItemRead {

...
    $items->Item($itemno)->Write($newvalue);
    
}

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OPC::Item::Write Matrikon.OPC.DDE:
    Win32::OLE(0.1707) error 0x80070057: "The parameter is incorrect"
    in METHOD/PROPERTYGET "Write"
 at C:/Program Files/Perl/lib/Win32/OLE/OPC.pm line 1666

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x $items->Item($itemno)->Read($OPCDevice)

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OPC::Item::Write Matrikon.OPC.DDE:
    Win32::OLE(0.1707) error 0x80070057: "The parameter is incorrect"
...
        Win32::OLE::OPC::Item::Write('Win32::OLE::OPC::Item=HASH(0x22c
+2360)', 11) called at opccompare.pl line 542
        main::OPCItemWrite('HASH(0x2291d14)', 5, 11) called at opccomp
+are.pl line 151
main::(opccompare.pl:154):                              if (not($debug
+ =~ m/quiet/)) {

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<b>Write(VALUE)</b>
     Write VALUE to this item.