Quest Controls BACnet T-Stat Servisní příručka stáhnout pdf (Strana 315)

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Application Examples • 315

Visualization and Control Using SCADA Software

WAGO-I/O-SYSTEM 750

BACnet/IP Controller

Example for MODBUS function codes

The MODBUS function codes for National Instruments’ SCADA software

“Lookout,” employ 6-bit encoding. For example, with the first bit here repre-

senting the function code:

Tab. 8-10: Example for MODBUS Function Codes

Input code MODBUS function code

0 FC1 ( read coils Reading several input bits

1 FC2 ( read input discretes Reading several input bits

3 FC3 ( read multiple registers Reading several input registers

4 FC4 ( read input registers Reading a single input register

The subsequent five positions indicate the channel number for the consecu-

tively numbered digital or analog input or output channels.

Examples

• Read the first digital input: e.g., 0 0000 1

• Read the second analog input: e.g., 3 0000 2

Application example

The digital input channel 2 of the "Measured data" node can be read out by in-

putting "Measured data . 0 0000 2".

Fig. 8-1: Example of user software G012913e

Additional Information

For a detailed description of how to use a specific software, refer to the man-

ual included with the corresponding SCADA product.

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