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Appendix | EtherCAT Documentation
optoNCDT 1900 / EtherCAT
- FRMW (Configured Address Read Multiple Write, reading of a physical area with fixed addressing, multiple writing)
A 5.2.3
Addressing and FMMUs
In order to address a slave in the EtherCAT® system, various methods from the master can be used. The sensor supports Full-Slave:
- Position addressing
The slave device is addressed via its physical position in the EtherCAT® segment.
The services used for this are APRD, APWR, APRW.
- Node addressing
The slave device is addressed via a configured node address, which was assigned by the master during the commissioning phase.
The services used for this are FPRD, FPWR and FPRW.
- Logical addressing
The slaves are not addressed individually; instead, a segment of the segment-wide logical 4-GB address is addressed. This seg-
ment can be used by a number of slaves.
The services used for this are LRD, LWR and LRW.
The local assignment of physical slave memory addresses and logical segment-wide addresses is implemented via the field bus
Memory Management Units (FMMUs). The configuration of the slave FMMUs is implemented by the master. The FMMU configuration
contains a start address of the physical memory in the slave, a logical start address in the global address space, length and type of
the data, as well as the direction (input or output) of the process data.
A 5.2.4
Sync Manager
Sync Managers serve the data consistency during the data exchange between EtherCAT® master and slaves. Each Sync Manager
channel defines an area of the application memory. The sensor has four channels.
- Sync manager channel 0: Sync manager 0 is used for mailbox write transfers (mailbox from master to slave).
- Sync manager channel 1: Sync manager 1 is used for mailbox read transfers (mailbox from slave to master).
- Sync manager channel 2: Sync manager 2 is normally used for process output data. Not used in the sensor.
- Sync manager channel 3: Sync manager 3 is used for process input data. It contains the Tx PDOs that are specified by the PDO
assignment object 0x1C13 (hex.).
Summary of Contents for ILD1900-10
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