7 Modbus TCP/IP Messaging
YASKAWA ELECTRIC SIEP C730600 59A V1000 Option Modbus TCP/IP Technical Manual 25
Enter Command Types
The drive supports two types of Enter Commands as shown in the table below. An Enter Command is enabled by writing
0 to register number 0900H or 0910H.
Enter Commands
Table 11 Enter Command Types
Note: Because the EEPROM can be written to a maximum of 100,000 times, refrain from frequently writing to the EEPROM. An Enter
Command is not required if reference or broadcast data are sent to the drive.
Enter Command Settings
When replacing earlier Yaskawa drive models with a 1000 Series drive and keeping the MEMOBUS/Modbus
communications settings, parameter H5-11 needs to be set in accordance with how the Enter Command functions in the
older drive. H5-11 determines if an Enter Command is needed or not in order to activate parameter changes in the drive.
• If upgrading from a G7 or F7 series drive to 1000 Series, set parameter H5-11 to 0.
• If upgrading from a V7 series drive to 1000 Series, set parameter H5-11 to 1.
H5-11 and the Enter Commands
Table 12 Enter Command Types
Message Format
The data section of the Modbus packet contains the Modbus message. In this data section, the master sends commands to
the slave and the slave responds. The message format is configured for both sending and receiving as shown below, and
the length of the packets depends on the command function content.
• UNIT IDENTIFIER
• FUNCTION CODE
•DATA
Unit Identifier
This field is used for intra-system routing purposes. It is typically used to communicate to a Modbus+ or a Modbus serial
line slave through a gateway between an Modbus TCP/IP network and a Modbus serial line. This field is set by the
Modbus master in the command and must be returned with the same value in the response by the slave. This is sometimes
referred to as the Unit ID. A drive using the option has no gateway functionality.
Function Code
When sent by the master, this field identifies the command to be undertaken by the slave. It also identifies the format for
the DATA section of the message. The slave normally echoes this command back to the master in its response message.
When the most significant bit of this field is set in the response message, it signals an error condition has occurred.
Register Number Description
0900H
Writes data into the EEPROM (non-volatile memory) of the drive and enables the data to RAM at the same time.
Parameter changes remain even if the power supply is cycled.
0910H Writes data in the RAM only. Parameter changes are lost when the drive is shut off.
H5-11 Settings H5-11 = 0 H5-11 = 1
Drive being replaced. G7, F7 V7
How parameter settings are
enabled.
When the Enter Command is received from the master. As soon as the value is changed.
Upper/lower limit check.
Upper/lower limit check is performed taking the settings
of related parameters into account.
The upper/lower limit of the changed parameter is
checked only.
Default value of related
parameters.
Not affected. The settings of related parameters remain
unchanged. Parameters must be changed manually if
needed.
The default settings of related parameters are changed
automatically.
Error handling when setting
multiple parameters.
Data is accepted even if one setting is invalid. The
invalid setting will be discarded. No error message
occurs.
Error occurs if only one setting is invalid. All data sent is
discarded.
Modbus_conditional_E.fm 25 ページ ２０１２年３月７日 水曜日 午前１１時３１分
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