ISPSoft User Manual Set the starting mode to Program Control; PLC decides whether the set data exchange is performed. PLC Run means that the set data exchange will be performed automatically when PLC is in RUN state. Always Enable means that the data exchange will be performed constantly when PLC is powered on. A new data exchange table will be added in area by clicking Add . The present data exchange table selected will be moved up or down by clicking Move Up and Move Down . The present data exchange table selected will be deleted by clicking Delete . The present data exchange table selected will be copied by clicking Copy and then can be pasted to the last row.
The data exchange table is listed and explained as below. Double click a data exchange table to be set so as to open the Item window as below. Select the checkbox of Enable to enable the data exchange table in the mode mentioned above. Remote Address is the address of the target slave for data exchange. The Shortest Update Cycle is the period for data exchange of the data exchange table. If the target device does not make any response within the time specified by Connection Timeout , that is timeout.
The master can complete the read and write in a command to improve the efficiency of data exchange by selecting Support Read/write synchronization (Function code 0x17) in which the specific MODBUS function code is used. Please make sure that all devices in data exchange support MODBUS function code for read and write synchronization. Otherwise, the read and write will fail on account of the failure to identify the function codes after the command from the master is received. Device Type is the model of a slave including Delta PLC and standard MODBUS devices.
3-188 Name Description Item The number of the block for data exchange Enable To select whether to enable the data exchange table when the data exchange is performed. Remote Station The target slave station address of the data exchange table IP Address The target IP address of the data exchange table. One IP address can be set for multiple data exchange tables. Local Address The device address range used by the master in the data exchange table > 「 >」:
Output; the data block where the master write to a slave Remote Address The device address range used by a slave in the data exchange table The device range will be in hexadecimal display, if the slave in the data exchange table is a user-defined MODBUS Device. Quantity The size of the data exchange table, which is basically consistent with the result calculated from the device range.