SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd. SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
Chapter 4 Explanation of Functions 4.4.2 Communication in Modbus-RTU mode (1) Communication protocol The communication between the inverter (slave) and external control system (master) is based on the following protocol: (1) (1) External control system Inverter (2) Waiting time (silent interval + communication wait time [C078]) Time (3) Communication trip limit time (C077) (If reception timeout occurs, the inverter will operate according to the setting of the operation selection after communication error [C076].) (1): Query frame that is sent from the external control system to the inverter (2): Response frame that is sent from the inverter to the external control system (3): Communication trip limit time (C077) If the inverter cannot complete the reception of a query from the master system (external control system) within the communication trip limit time, after having sent a response to the preceding query, the inverter enters the status in which to receive the query from the beginning. Subsequently, the inverter returns no response to the master system. After reception timeout occurs, the inverter operates according to the setting of the selection of operation after communication error (C076). For details, see the table below. Monitoring of reception timeout begins when the first communication is performed after the inverter power has been turned on or the inverter has been reset. Reception timeout is monitored only when the inverter communicates with the master system. Item Function code Range of data Description 00: Tripping The inverter trips (E41) after reception timeout. The inverter decelerates and stops the 01: Tripping after motor, and then trips (E41) after reception stopping the motor timeout. Selection of operation after communication error Communication trip limit time setting C076 02: Ignoring the errors 03: Stopping the motor after free-running (FRS) 04: Decelerating and stopping the motor Communication wait time C078 0. to 1000. (ms) The inverter ignores the error without tripping and alarm output. The inverter stops the motor after free-running without tripping and alarm output after reception timeout. The inverter decelerates and stops the motor without tripping and alarm output after reception timeout. C077 0.00 to 99.99 (s) Limit time to determine the reception timeout Time to wait until the inverter starts sending a response after reception of a query (excluding the silent interval) The inverter sends a response (frame (2)) always after receiving a query (frame (1)). The inverter does not actively output any frame to the external control system. 4 - 130
Chapter 4 Explanation of Functions The formats of the query and response frames are described below. Message configuration: Query Header (silent interval) Slave address Function code Data Error check code Trailer (silent interval) (i) Slave address The slave address is a number 1 to 32 that is assigned to the inverter (slave) beforehand. (A query is received by the inverter having the same slave address as that specified in the query.) The query with the slave address set to "0" is broadcasted to all the connected inverters. With a broadcast query, the master system can neither read inverter data nor perform a loopback test. (ii) Data The data contains a functional instruction. The SJ700 series inverter supports the following Modbus data format: Data name Coil data Register data Description 1-bit binary data that can be referenced and changed 16-bit data that can be referenced and changed (iii) Function code The function code specifies the function to be executed by the inverter. The table below lists the function codes supported by the SJ700 series inverter. Function codes Function code Function Maximum number of data Maximum data count in a bytes in a message message 01h Reads the coil status. 4 32 coils (in units of bit) 03h Reads registers. 8 4 registers (in units of byte) 05h Writes data to a coil. 2 1 coil (in units of bit) 06h Writes data to a register. 2 1 register (in units of byte) 08h Performs a loopback test. - 0Fh Writes data to multiple coils. 4 32 coils (in units of bit) 10h Writes data to multiple registers. 8 4 registers (in units of byte) 4 - 131
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Chapter 4 Explanation of Functions<br />
The formats of the query and response frames are described below.<br />
Message configuration: Query<br />
Header (silent interval)<br />
Slave address<br />
Function code<br />
Data<br />
Error check code<br />
Trailer (silent interval)<br />
(i) Slave address<br />
The slave address is a number 1 to 32 that is assigned to the inverter (slave) beforehand. (A query is<br />
received by the inverter having the same slave address as that specified in the query.)<br />
The query with the slave address set to "0" is broadcasted to all the connected inverters.<br />
With a broadcast query, the master system can neither read inverter data nor perform a loopback test.<br />
(ii) Data<br />
The data contains a functional instruction.<br />
The <strong>SJ700</strong> series inverter supports the following Modbus data format:<br />
Data name<br />
Coil data<br />
Register data<br />
Description<br />
1-bit binary data that can be referenced and changed<br />
16-bit data that can be referenced and changed<br />
(iii) Function code<br />
The function code specifies the function to be executed by the inverter.<br />
The table below lists the function codes supported by the <strong>SJ700</strong> series inverter.<br />
Function codes<br />
Function code<br />
Function<br />
Maximum number of data Maximum data count in a<br />
bytes in a message<br />
message<br />
01h Reads the coil status. 4 32 coils (in units of bit)<br />
03h Reads registers. 8 4 registers (in units of byte)<br />
05h Writes data to a coil. 2 1 coil (in units of bit)<br />
06h Writes data to a register. 2 1 register (in units of byte)<br />
08h Performs a loopback test. -<br />
0Fh Writes data to multiple coils. 4 32 coils (in units of bit)<br />
10h Writes data to multiple registers. 8 4 registers (in units of byte)<br />
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