Modbus TCP and UDP library for PHP., originally from code.google.com/p/phpmodbus
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<?php
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require_once dirname(__FILE__) . '/../Phpmodbus/ModbusMaster.php';
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// Create Modbus object
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$ip = "192.192.15.51";
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$modbus = new ModbusMaster($ip, "UDP");
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try {
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// FC 3
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$moduleId = 0;
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$reference = 12288;
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$mw0address = 12288;
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$quantity = 6;
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$recData = $modbus->readMultipleRegisters($moduleId, $reference, $quantity);
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}
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catch (Exception $e) {
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echo $modbus;
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echo $e;
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exit;
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}
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?>
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=windows-1250">
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<meta name="generator" content="PSPad editor, www.pspad.com">
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<title>WAGO 750-841 M-memory dump</title>
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</head>
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<body>
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<h1>Dump of M-memory from WAGO 750-84x series coupler.</h1>
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<ul>
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<li>PLC: 750-84x series</li>
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<li>IP: <?php echo $ip?></li>
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<li>Modbus module ID: <?php echo $moduleId?></li>
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<li>Modbus memory reference: <?php echo $reference?></li>
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<li>Modbus memory quantity: <?php echo $quantity?></li>
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</ul>
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<h2>M-memory dump</h2>
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<table border="1px" width="400px">
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<tr>
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<td>Modbus address</td>
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<td>MWx</td>
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<td>value</td>
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</tr>
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<?php
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for($i=0;$i<count($recData);$i+=2) {
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?>
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<tr>
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<td><?php echo $i+$reference?></td>
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<td>MW<?php echo ($i + $reference - $mw0address)/2?></td>
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<td><?php echo ($recData[$i] << 8)+ $recData[$i+1]?></td>
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</tr>
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<?php
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}
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?>
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</table>
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<h2>Modbus class status</h2>
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<?php
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echo $modbus;
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?>
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</body>
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</html>
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