Bus Topology And Cabling - Leuze electronic MSI 400 Series Manual

Pre-Operational (Pre-OP)
In the transition from Init to Pre-Op, the EtherCAT checks whether the mailbox was initialized correctly.
In the Pre-Op state mailbox communication is possible but not process data communication. Furthermore,
in this state the settings for the transmission of process data and module-specific parameters are transmit-
ted where they deviate from the standard settings.
Safe-Operational (Safe-OP)
In the transition from Pre-Op to Safe-Op the EtherCAT coupler checks whether the channels for process
data communication are correct. Before it acknowledges the state change, the EtherCAT gateway copies
current output data into the corresponding DP RAM areas of the EtherCAT gateway controller. In the Safe-
Op state mailbox and process data communication are possible. Here the output data are updated cyclic-
ally while the input data are set to zero.
Operational (Op)
In the "Op" state the EtherCAT gateway copies the data in the RX-PDO onto its input data set 1. The out-
put data set 1 is copied by the gateway into the TX-PDO and sent to the EtherCAT master.
Bootstrap optional (Boot)
not implemented
11.4

Bus topology and cabling

EtherCAT uses Ethernet as the transmission medium. Standard CAT5 cable is used. Cable lengths of up to
100 m between 2 devices are possible.
Only EtherCAT components may be used in an EtherCAT network. To implement topologies deviating from
the linear structure corresponding EtherCAT components are required that support this. It is not possible to
use hubs.
An EtherCAT network always consists of a master and any number of EtherCAT slaves (gateways or
couplers). Each EtherCAT slave has an RJ45 socket IN and OUT. The incoming EtherCAT cable from the
direction of the master should be plugged into the socket labeled IN. The RJ45 socket ECAT-OUT is used
to connect further EtherCAT devices in the same strand in order to create so-called "daisy chains". In the
last device the OUT socket remains free.
EtherCAT RJ45 bus interface
Note: The device supports the Auto Crossover function.
Pin
1
2
3
4
5
6
7
8
Housing
Tab. 11.3: Ethernet connection data
Pin
Medium
Cable length
Transfer rate
Leuze electronic
Signal
TX+
TX-
RX+
Term 1
Term 1
RX-
Term 2
Term 2
Screen
Signal
2 x 2 pair twisted copper cable, CAT5 (100 MBit/s)
max. 100 m
100 MBit/s
Setup
MSI 400
EtherCAT Gateway
155