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11.2.5 EtherCAT Master
Parameter Description
Maximum number of EtherCAT slaves Maximum of 388 slaves, if RCX_GET_SLAVE_HANDLES_REQ service
is used for determining number of slaves
The number of usable slaves depends on several parameters: the
available memory for the configuration file (see ‘configuration file’
below), used cycle time, frame propagation time
Maximum number of cyclic input data Appr. 4600 bytes, if no LRW command (Logical Read Write) is used for
process data
Maximum number of cyclic output data Appr. 4600 bytes, if no LRW command (Logical Read Write) is used for
process data
Acyclic communication CoE (CANopen over EtherCAT): SDO, SDOINFO, Emergency
FoE (File Access over EtherCAT)
Configurable with SYCON.net: CoE
If the file ETHERCAT.XML contains the appropriate configuration
information (e.g. created with "EtherCAT Configurator"), the CoE
function can be used
Mailbox protocols CoE, FoE
Functions Distributed Clocks
Redundancy
Slave diagnostics
Bus scan
Minimum bus cycle time 250 µs, depending on the used number of slaves and the used number
of cyclic input data and output data.
Topology Line or ring
Slave station address range 1 – 14335
Data transport layer Ethernet II, IEEE 802.3, 100 MBit/s, full-duplex
Configuration file
(ETHERCAT.XML or CONFIG.NXD) NHST-T100-EN: Maximum 2 MByte
Synchronization via ExtSync Supported (not configurable with SYCON.net)
ENI Slave-to-Slave copy infos Supported (not configurable with SYCON.net)
Hot Connect Supported (not configurable with SYCON.net)
Limitations The size of the bus configuration file is limited by the size of the Flash
disk (2 MByte)
Store-and-forward switches cannot be used within network topology
due to hard receive timing model
RCX_GET_SLAVE_HANDLES_REQ can only communicate up to 388
slaves
Process data is restricted by the dual-port memory to 5760 bytes
Reference to firmware / stack version V4.4
Table 55: Technical data EtherCAT Master protocol
netHOST NHST-T100 | LAN controlled master devices
DOC130401UM05EN | Revision 5 | English | 2018-05 | Released | Public © Hilscher 2013 – 2018