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Modbus Commands

2-35

SIMATIC TI505/TI500 MODNIM User Manual

Code

16 allows the host computer to write multiple values into successive

registers. Addressing is sequential up to the maximum memory size for a

particular PLC. The maximum number of registers that can be addressed

with one command is 100. If more are given, the whole command will be

rejected with an Exception code 03.

[This command is equivalent to a TIW

Y I request using Primitive 30 with

-type 01 (V

ariable memory)].

Because

of differences in memory mapping between Modbus PLCs

and SIMA

TIC TI PLCs, you should be quite certain of the effects of

the broadcast command before issuing it.

Example:

02 10 0078 0002 04 000B 0201 XXXX

Checksum (XXXX)

2nd register data (0201)

1st register data (000B)

Number of bytes (04)

Number of registers (0002)

Start register address (0078)

Function code 16 (10 hex)

Slave address (02)

Request:

Figure 2-30 Write

Multiple Registers Example — Request

This request to the secondary node is to change the values of 2 holding

registers, starting at address 0078 (120 decimal) to 1

1 and 513 respectively

Response: 02 10 0078 0002 XXXX

Checksum (XXXX)

Number of registers (0002)

Start register address (0078)

Function code 16 (10 hex)

Slave address (02)

Figure 2-31 Write

Multiple Registers Example — Response

The response to this command is to return the address, code, starting

address, and the numbers of registers to be changed.

Code 16 — W

rite

Multiple Registers

WARNING

1 2 ... 61 62 63 64 65 66 67 68 69 70 71 ... 90 91

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