Modbus TCP and UDP library for PHP., originally from code.google.com/p/phpmodbus
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php-modbus/examples/example_fc15.php

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<?php
require_once dirname(__FILE__) . '/../Phpmodbus/ModbusMaster.php';
// Create Modbus object
$modbus = new ModbusMaster("192.192.15.51", "UDP");
// Data to be writen
$data = array(TRUE, FALSE, TRUE, TRUE, FALSE, TRUE, TRUE, TRUE,
TRUE, TRUE, TRUE, TRUE, FALSE, FALSE, FALSE, FALSE,
FALSE, FALSE, FALSE, FALSE, TRUE, TRUE, TRUE, TRUE,
TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE, TRUE);
try {
// FC15
$modbus->writeMultipleCoils(0, 12288, $data);
}
catch (Exception $e) {
// Print error information if any
echo $modbus;
echo $e;
exit;
}
// Print status information
echo $modbus;