
Chapter 6 Deployment PtP communication
Manual VIPA System 300S SPEED7
6-2
HB140E - CPU SC - RE_313-6CF03 - Rev. 07/45
Fast introduction
The RS485 interface X3 of the CPU 313SC/DPM may be set to PtP
communication (
p
oint-
t
o-
p
oint) by means of a hardware configuration.
The RS485 interface in PtP operation supports the serial process
connection to different source or destination systems.
The protocols res. procedures ASCII, STX/ETX, 3964R, USS and Modbus
are supported.
The parameterization happens during runtime using the SFC 216
(SER_CFG). For this you have to store the parameters in a DB for all
protocols except ASCII.
The communication is controlled by SFCs. Send takes place via SFC 217
(SER_SND) and receive via SFC 218 (SER_RCV).
The repeated call of the SFC 217 SER_SND delivers a return value for
3964R, USS and Modbus via RetVal that contains, among other things,
recent information about the acknowledgement of the partner station.
The protocols USS and Modbus allow to evaluate the receipt telegram by
calling the SFC 218 SER_RCV after SER_SND.
The SFCs are included in the consignment of the CPU.
The following SFCs are used for the serial communication:
SFC
Description
SFC 216
SER_CFG
RS485 parameterize
SFC 217
SER_SND
RS485 send
SFC 218
SER_RCV
RS485 receive
General
Protocols
Parameterization
Communication
Overview SFCs
for serial
communication
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Страница 122: ...Chapter 5 Deployment I O periphery Manual VIPA System 300S SPEED7 5 36 HB140E CPU SC RE_313 6CF03 Rev 07 45 ...
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