Problem to convert in float

[ELGUEROUEL]

require_once("../src/phosphor7.php");

$c = new TSnap7MicroClient();

$c->ConnectTo("10.11.6.2", 0, 0);

$buffer = "";
$c->DBRead(7, 48, 2, $buffer); // I want read value of energy
var_dump(bin2hex($buffer));
$c->Disconnect();
I have in output 477d but it is false ( because is not real)

[chaosben]

I'm sorry, but i have no cpu to test it.
Can anyone else please test and debug this issue?

[ELGUEROUEL]

thanks for your replay .
I tested it .
I have a cpu 1500

[cervejapils]

If you want lo read a float value (in PLC named REAL), use s7_phphelper::getS7_Real.
I test it on S7-300 CPU and work well.
Remember to read 4bytes for every REAL value.

require_once("../src/phosphor7.php");
require_once("../src/s7_phphelper.php");

$c = new TSnap7MicroClient();

$c->ConnectTo("192.168.1.216", 0, 2);
$floatBuff = "";
$c->DBRead(101, 38, 8, $floatBuff);    // from DB101.DBB38 for 8 bytes
$c->Disconnect();

$fVal  = s7_phphelper::getS7_Real($floatBuff, 0);
echo "1st float: " . $fVal . "\n";    // 12.34 in my PLC

$fVal  = s7_phphelper::getS7_Real($floatBuff, 4);
echo "2nd float: " . $fVal . "\n";    // 5.6 in my PLC

For S7-1500 the data block must have the flag optimized block off.