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SIMATIC S7-200: S7 Series 200 Automation System Modbus Protocol slave!

Hi everybody
I'm using modbus library for s7-200-microwin.I've downloaded the slave program(mbus-init and mbus-slave)on plc and have run it but the error output of mbus-init has the error code 5(Holding registers overlap Modbus Slave symbols) and so the error output of mbus-slave has the error code 10(Slave function not enabled).when I separate holding registers from slave symbols the error output of mbus-init would have the error code 1(Memory range error) and the error output of mbus-slave would remain 10.can anybody guide me what to do?
thanks
Shahed

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