Hello David I always presumed (not to say 'assumed') that Siemens did not support Modbus/TCP. You can configure the S7-200 to act as a Modbus RTU. Using the Modbus Master Protocol Library. Are you sure the S7-200 uses Modbus? With libraries MBUS_INIT and MBUS_SLAVE. Caution: Interconnecting equipment with different reference potentials can cause. With the Modbus Master Protocol instructions, you can configure the S7-200 to act as a Modbus RTU master device and communicate to one or more Modbus slave devices. Using the Modbus Master Protocol Library (v1.2). Are you sure the S7-200 uses Modbus? You can download working VB Modbus project from Modbus/USS library for Microwin.
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