178 JVL Industri Elektronik A/S - User Manual - Ethernet for MAC and MIS motors
8.1 Introduction to SERCOS
SERCOS
®
is an abbreviation for SErial Realtime COmmunication Standard, and is a glob-
ally standardized digital interface for communication between master control systems,
drive units and other peripherals.
SERCOS
®
in its third edition – SercosIII – is a Real Time Ethernet technology which aims
to maximize the use of the 100 Mbit, full duplex Ethernet bandwidth. It overcomes the
overhead normally associated with Ethernet by employing "on the fly" processing.
A SERCOS
®
net consists of a master system and up to 511 slave devices, connected with
standard Ethernet cabling.
The JVL implementation supports both the FSP IO profile and the FSP Drive profile. FSP
Drive profile, page 207 is dedicated the FSP Drive profile which is factory default.
FSP IO / JVL profile, page 216 is dedicated the FSP IO profile which is used by the “JVL”
profile also used in other Ethernet based protocols.
The examples and screen shots in this manual are taken from MacTalk and the In-
draWorks application for BoschRexroth masters, but please be aware that other SER-
COS
®
PLC vendors exist
For more information on SERCOS
®
please visit the official homepage at this address:
https://www.sercos.org/
8.1.1 Abbreviations
Following general used terms are useful to know before reading the following chapters.
100Base-Tx 100 MBit Ethernet on twisted pairs.
AT Acknowledge Telegram – Telegram from slave to master (motor to PLC).
Cyclic data Data which is transferred at every cycle from master to slave or from
slave to master.
CP0-CP4 Communication Phases 0-4.
FG Function Group.
FSP Function Specific Profile.
FSP IO Function Specific Profile Input Output (Basic IO profile used by the JVL
Profile).
FSP Drive Function Specific Profile Drive (Standard Drive profile used by Sercos
®
).
GDP Generic Device Profile
SDDML Slave description file in the xml language. Found on the JVL homepage.
IDN Identification Number (of a parameter).
IP Internet Protocol - IP address ~ the logical address of the device, which
is user configurable.
MAC Media Access Controller - MAC address ~ the hardware address of the
device.
MDT Master Data Telegram – Telegram from master to slave (PLC to motor).
NRT Non-Real Time. Default state before Sercos communication is started.
OL Operation level (motor ready to operate). Normally coupled to commu-
nication state machine so motor is in OL when in CP4.
PL Parameterization level. Normally coupled to communication state ma-
chine so motor is in PL when in CP2.
PackProfile Drive profile originating from SercosII, but still in use (requires no XML
file)
Sercos Drive Drive which is PackProfile compatible.
SCP Sercos
®
Communication Profile.
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