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System 300S
6
Deployment PtP communication
6.1 Fast introduction
General
Protocols
Parametrization
Communication
Overview FCs/SFCs for
serial communication
HB140 | CPU | 315-4PN23 | en | 18-02
The CPU has a PROFIBUS/PtP interface with a fix pinout. After an overall reset the inter-
face 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 RetVal that con-
tains, 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 FC/SFC 218 SER_RCV after SER_SND. The FCs/SFCs are included in the consign-
ment of the CPU.
The following FCs/SFCs are used for the serial communication:
FC/SFC
FC/SFC 216
FC/SFC 217
FC/SFC 218
More information about the usage of these blocks may be found in the
manual "SPEED7 Operation List" from Yaskawa.
Deployment PtP communication
Description
SER_CFG
RS485 parameterize
SER_SND
RS485 send
SER_RCV
RS485 receive
Fast introduction
75
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