Modbus TCP and UDP library for PHP., originally from code.google.com/p/phpmodbus
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php-modbus/examples/example_fc16.php

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<?php
require_once dirname(__FILE__) . '/../Phpmodbus/ModbusMasterUdp.php';
// Create Modbus object
$modbus = new ModbusMasterUdp("192.192.15.51");
// Data to be writen
$data = array(1000, 2000, 3.0);
$dataTypes = array("INT", "DINT", "REAL");
try {
// FC16
$modbus->writeMultipleRegister(0, 12288, $data, $dataTypes);
}
catch (Exception $e) {
// Print error information if any
echo $modbus;
echo $e;
exit;
}
// Print status information
echo $modbus;
?>