Siemens SIMATIC TIWAY 1 Especificaciones Pagina 25

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Getting Started
2–10
Getting Started
What communications program should I use?
There are two types of communications programs, RLL instructions or DirectNET
protocol programs. The network configuration determines the type of
communications program required.
S PLC as Master The PLC master requires instructions in the RLL
program to initiate the requests for data.
S Peer as Master Both peer masters require instructions in the RLL
program. Since both stations contain network instructions, either station
can initiate a request for data.
S Host as Master Host computers or operator interfaces must execute
communications programs that can issue network commands with the
DirectNET protocol. Youll either have to use a DL405 driver, (that
hopefully came with your host software package or operator interface),
or youll have to create one.
The RLL instructions are used to describe and initiate the operation the DCM will
process. Heres an example of a simple RLL communications program. Chapter 4
provides a detailed description of the instructions.
Read Example Write Example
Y50
SetSP125
SP124
LD
K0201
LD
K0003
LDA
O1400
RX
Y0
Y50
SetSP125
SP124
LD
K0201
LD
K0003
LDA
O1400
WX
Y0
Communication Error
Module Not Busy
Load Constant
Load Constant
Load Address
Read Data
From
Network
Communication Error
Module Not Busy
Load Constant
Load Constant
Load Address
Write Data To
Network
Two Options
RLL Programs
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