Siemens SITRANS LR 300 Instruction Manual page 92

• If the host attempts to write one or more registers that are out of range, an
exception response code 2 or 3 is generated depending on whether the start
address is valid.
• If the host used an unsupported function code, an exception response code of 01
should be generated. However, this is not guaranteed and there may be no
response.
Page 90 SITRANS LR 300– INSTRUCTION MANUAL 7ML19985CL02