add_modbus_rtu_signal()

Definition

add_modbus_rtu_signal(slaveid=1, port=None, baudrate=115200, bytesize=DR_EIGHTBITS, parity=DR_PARITY_NONE, stopbits=DR_STOPBITS_ONE, name, reg_type, index)

Starting with version 3.5, the value parameter of the add_modbus_signal function has been removed. Programs that previously used this function may encounter an error pop-up.

Features

This function registers the ModbusRTU signal. The Modbus I/O must be set in the Teach Pendant I/O set-up menu. Use this command only for testing if it is difficult to use the Teach Pendant. The Modbus menu is disabled in the Teach Pendant if it is set using this command.

Parameters

Parameter Name	Data Type	Default Value	Description
slaveid	int	1	Slave ID of the ModbusRTU (0 or 1-247) 0 : Broadcase address
port	string	None	E.g.) “COM”, “COM_USB”, “/dev/ttyUSB0”
baudrate	int	115200	Baud rate 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200
bytesize	int	8	Number of data bits DR_EIGHTBITS: 8
parity	string	"N"	Parity checking DR_PARITY_NONE: "N" DR_PARITY_EVEN: "E" DR_PARITY_ODD: "O"
stopbits	int	1	Number of stop bits DR_STOPBITS_ONE =1 DR_STOPBITS_TWO = 2
name	string	-	Modbus signal name
reg_type	int	-	Modbus signal type DR_DISCRETE_INPUT =DR_MODBUS_DIG_INPUT DR_COIL =DR_MODBUS_DIG_OUTPUT DR_INPUT_REGISTER =DR_MODBUS_REG_INPUT DR_HOLDING_REGISTER =DR_MODBUS_REG_OUTPUT
index	int	-	Modbus signal index

Return

Value	Description
0	Success
Negative value	Failed

Exception

Exception	Description
DR_Error (DR_ERROR_TYPE)	Parameter data type error occurred
DR_Error (DR_ERROR_VALUE)	Parameter value is invalid
DR_Error (DR_ERROR_RUNTIME)	C extension module error occurred
DR_Error (DR_ERROR_STOP)	Program terminated forcefully

Example

Python

add_modbus_rtu_signal(slaveid=1, port=port_info, baudrate=115200, bytesize=DR_EIGHTBITS, parity=DR_PARITY_NONE, stopbits=DR_STOPBITS_ONE, name=’di1’, reg_type=DR_INPUT_REGISTER, index=0)
add_modbus_rtu_signal(slaveid=1, port=port_info, baudrate=115200, bytesize=DR_EIGHTBITS, parity=DR_PARITY_NONE, stopbits=DR_STOPBITS_ONE, name=’do1’, reg_type=DR_HOLDING_REGISTER, index=0)