FR-A701 INSTRUCTION MANUAL (Applied) - Automation Systems ...

4PARAMETERS(5) Message format typesCommunication operation and settingThe message formats corresponding to the function codes in Table 1 on page 318 will be explained.• Read holding register data (H03 or 03)Can read the description of 1) system environment variables, 2) real-time monitor, 3) faults history, and 4)inverter parameters assigned to the holding register area (refer to the register list (page 324)).Query Message1) Slave Address 2) Function 3) Starting Address 4) No. of Points CRC Check(8bit)Normal response (Response message)1) Slave Address 2) Function 5) Byte Count 6) Data CRC Check(8bit)⋅ Query message settingMessageH03(8bit)H03(8bit)⋅ Description of normal responseH(8bit)(8bit)L(8bit)H(8bit)H(8bit)L(8bit)L(8bit)L(8bit)...(n × 16bit)Setting DescriptionH(8bit)L(8bit)1)Slave AddressSet the address to which the message will be sent. Broadcastcommunication cannot be made (0 is invalid).2)Function Set H03.3)Starting Address4)No. of PointsH(8bit)Set the address at which holding register data read will be started.Starting address = starting register address (decimal) − 40001For example, setting of the starting address 0001 reads the data of theholding register 40002.Set the number of holding registers from which data will be read. Thenumber of registers from which data can be read is a maximum of 125.5)Byte Count6)DataMessageSetting DescriptionThe setting range is H02 to H14 (2 to 20).Twice greater than the No. of Points specified at 4) is set.The number of data specified at 4) is set. Data are read in order of Hi byteand Lo byte, and set in order of starting address data, starting address + 1data, starting address + 2 data, ...Example) To read the register values of 41004 (Pr. 4) to 41006 (Pr. 6) from the slave address 17 (H11)Query messageSlave Address Function Starting Address No. of Points CRC CheckH11(8bit)H03(8bit)H03(8bit)HEB(8bit)H00(8bit)H03(8bit)H77(8bit)H2B(8bit)Normal response (Response message)Slave Address Function Byte Count Data CRC CheckH11(8bit)H03(8bit)H06(8bit)H17(8bit)H70(8bit)H0B(8bit)HB8(8bit)H03(8bit)HE8(8bit)H2C(8bit)HE6(8bit)Read valueRegister 41004 (Pr. 4): H1770 (60.00Hz)Register 41005 (Pr. 5): H0BB8 (30.00Hz)Register 41006 (Pr. 6): H03E8 (10.00Hz)319