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Technical Data

3.3 Conﬁguration

Drive 94 supports Modbus communication protocol through its RS485 optional card.

The following Communication parameters are available:

RS485 conﬁguration – If the value of this parameter is ‘Modbus slave’ the modbus slave protocol is

enabled on the RS485 port. If the value is ‘Normal’ the RS485 works in PPP mode.

Modbus baud rate – the RS485 baud rate in modbus mode. Note that modbus requires 2 stop bits

and no parity.

Modbus reply delay – The delay introduced after receiving modbus request and before sending a

reply. Note that this delay will always be >= 3.5 characters as required by the modbus speciﬁcation.

Some modbus master devices are slow and an increase of the ‘Modbus reply delay’ value might be

required to successfully work with these devices.

Each device in the Modbus network must have its own unique network address.

The ‘Addr’ submenu on the drive display and the front panel buttons can be used to set the Modbus

network address.

Drive 94 is Modbus slave devices in a single master multiple (or one) slaves network.

(Sometimes Slave devices are named servers because they wait for requests.)

Drive 94 communicates on the other end with Modbus Master.

Most Terminals can be conﬁgured as Masters with a Modbus Generic driver.

3.4 Supported Modbus features

Drive 94 uses the Modbus protocol delay of 3.5 characters time between packets to determine the

end of packet.

The following ModBus functions are supported:

• 01 (0x01) Read Coils

• 02 (0x02) Read Discrete Inputs

• 03 (0x03) Read Holding Registers

• 04 (0x04) Read Input Registers

• 05 (0x05) Write Single Coil

• 06 (0x06) Write Single Register

• 15 (0x0F) Write Multiple Coils

• 16 (0x10) Write Multiple Registers

When the drive receives ModBus function it executes it and replies with Normal message, Exception

Message or No message as described by the Modbus Application protocol Speciﬁcation V1.1.

Modbus broadcast address is supported by the drive 94 also. In this case after receiving correct

Modbus request the drive executes it but does not send any reply back.

The DWORD (double word) and FLOAT numbers are send with the LOW WORD FIRST convention

by the 94 drive.

Note that some Terminals may have to be conﬁgured appropriately in order to accept such a WORD

order.

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Lenze RS-485 module Manual de usuario Pagina 6