15
Number of slaves
Up to 125 slaves. AM401: supports 4 DSP402 slaves; AM402:
supports 8 DSP402 slaves
EtherCAT frame
length
44–1498 bytes
Process data
Max. 1486 bytes per Ethernet frame
2）
Wiring
The CPU module provides a CN4 port for EtherCAT bus communication. An ECT
communication network cable that meets the following requirements is a must:
$BCMFDPOOFDUPS1$QSPOH
"8($BUFTIJFMEFEUXJTUFEQBJS
$BCMFDPOOFDUPS1$QSPOH
Figure 6 Requirements on the EtherCAT cable
■
Signal pins
Pin
Signal
Signal Direction
Signal Description
1
TD+
Output
Data trans
2
TD-
Output
Data transmission-
3
RD+
Input
Data re
4
--
--
Not used
5
--
--
Not used
6
RD-
Input
Data reception–
7
--
--
Not used
8
--
--
Not used
■
Length requirements:
According to FastEthernet technology, when an EtherCAT bus is used, the length
of the cable between the devices must not exceed 100 meters. Exceeding this
length will attenuate the signal and affect communication.
■
Technical requirements:
100% continuity test, no short circuit, open circuit, misalignment and poor
contact. It is recommended to use the following cables: