User`s manual

SH-300 User’s Manual Connection with PLC
Page 79 of 103
Note:
1. When selecting “3x” as register address type, single or double register only can be read, not to
be written.
2. When selecting “4x” as register address type to read or write double register. the first byte
contains the high order bit and the second contains the low order bit.
3. When selecting “5x” as register address type to read or write double register. The first byte
contains the low order bit and the second contains the high order bit.
4. When selecting “6x” as register address type, only single register can be read or written
5.”bit” expresses the bit address of Register value. It is in the range of”0~F”. The register value is
expressed as the data of sixteen bit binary. Each bit expresses one coil status. Status is
indicated as: 1 = ON, 0 = OFF.
6. when selecting “4x_bit” as address type of function key , one bit of register value can be set “0”
or “1’”. (single or double Register).
6. Parameter setting in the SH-300 software
6.1 Consult PLC user manual about setting communication port parameter in Modbus protocol.
Click “Set plc type” under “Connect” option, and set the SH-300 communication parameter. In
order to communicate with the PLC normally, the communication parameter of SH-300 must
be consistent with that of PLC.
6.2 Consult PLC user manual and work out the data address accurately. Different type PLC uses
different method of calculating data address. The following examples will introduce the
operation of some coils and registers with SH-300 software in MODBUS protocol.
6.2.1 Here is an example of setting coil M15 status
Use the function key “ ” to set coil M15 status. According to “the list of corresponding
relationship between address type and function codes in Modbus Protocol” the address
type of setting coil status is “0X”. Inner coil(M) address is in the range of M0-M512(D). MODBUS
data address is in the range of 3072-3583. The corresponding MODBUS data address of M15 is
3087.