User Manual of EM760 High-Performance Inverter ● Response PDU ● Error PDU Below is an example of a request to set the acceleration time 1 (F00.14) to 5.00 and deceleration time 1 (F00.15) to 6.00: * This function code cannot be used to change the parameters of the attribute “○” (it cannot be changed during operation). That is, only the parameters of the attribute “●” (it can be changed during operation) can be changed. Otherwise, the error code 1 will be returned. 10.3.3.4 0x08:
function code for diagnosis The Modbus function code 08 involves a series of tests to check the communication system between the client (master station) and server (slave station), or internal error statuses ofthe server. The test to be executed is defined by the sub-function code fields of two bytes in the request. The server makes responses properly. Copy the function codes and sub-function codes. Some diagnoses will enable the remote terminal unit to return the corresponding data through the data field in normal response. Under normal circumstances, when the diagnosis function is sent to the remote terminal unit, the user program in this remote terminal unit will not be affected.
Diagnosis can’t access user logic such as discrete magnitude and the register. The error counter in the remote terminal unit can be remotely reset by applying some functions.
258 Function code 1 byte 0x42 Starting Address 2 bytes 0x0000~0xFFFF Number of registers 2 bytes 1~16 Error code 1 byte 0xC2 Exception code 1 byte See Table 6-26 Request Respond Domain name (0x) Domain name (normal) (0x) Domain name (abnormal) (0x) Function 42 Function 42 Function C2 Starting address Hi 00 Starting address Hi 00 Exception code 03 Starting address Lo 0E Starting address Lo 0E Number (Hi) of registers 00 Number (Hi) of registers 00 Number (Lo) ofregisters 02 Number (Lo) of registers 02 Number of bytes 04 Register value Hi (F00.14) 01 Register value Lo (F00.14) F4 Register value Hi (F00.15) 02 Register value Lo (F00.15) 58