VIPA CPU 314ST - Deployment PtP communication; Fast introduction

7 Deployment PtP communication
7.1 Fast introduction
The CPU has a PROFIBUS/PtP interface with a fix pinout. After an
overall reset the interface is deactivated. By appropriate configuration
the PtP function (point to point) can be enabled:
n PtP functionality
–
Using the PtP functionality the RS485 interface is allowed to
connect via serial point-to-point connection to different source
res. target systems.
– The activation of the PtP functionality happens by embedding
the SPEEDBUS.GSD from VIPA in the hardware catalog. After
the installation the CPU may be configured in a PROFIBUS
master system and here the interface may be switched to PtP
communication.
The protocols res. procedures ASCII, STX/ETX, 3964R, USS and
Modbus are supported.
The parametrization of the serial interface happens during runtime
using the FC/SFC 216 (SER_CFG). For this you have to store the
parameters in a DB for all protocols except ASCII.
The FCs/SFCs are controlling the communication. Send takes place
via FC/SFC 217 (SER_SND) and receive via FC/SFC 218
(SER_RCV). The repeated call of the FC/SFC 217 SER_SND
delivers a return value for 3964R, USS and Modbus via RetV
al that
contains, among other things, recent information about the acknowl-
edgement of the partner station. The protocols USS and Modbus
allow to evaluate the receipt telegram by calling the FC/SFC 218
SER_RCV after SER_SND. The FCs/SFCs are included in the con-
signment of the CPU.
The following FCs/SFCs are used for the serial communication:
FC/SFC Description
FC/SFC 216 SER_CFG RS485 parameterize
FC/SFC 217 SER_SND RS485 send
FC/SFC 218 SER_RCV RS485 receive
More information about the usage of these blocks may
be found in the manual "SPEED7 Operation List" from
VIP
A.
General
Protocols
Parametrization
Communication
Overview FCs/SFCs for
serial communication
VIPA System 300SDeployment PtP communication
Fast introduction
HB140 | CPU | 314-6CF03 | GB | 16-43 178