EtherCAT-STO Cable

Overview

The following picture demonstrates the concept of Synapticon’s EtherCAT-STO Cable. There are two types of cables that are considered:

• A Y-Splitter cable that connects the first servo drive with the master.

  It has two terminals:

  • A standard RJ45 connector for the Ethernet communication with the master

  • A three strand wire that needs to be connected to your safety output (STO-SBC In 1, STO-SBC In 2 and Safety Ground)

• A Drive-to-Drive cable that connect servo drives with each other.

  These cables have a customized connector that incorporates pins for all necessary signals.

Pinout of the connectors

Hybrid connector (JST GHR-08V-S)

Note

This connector is on the drive side of the Y-Splitter cable and on both sides of the Drive-to-Drive cable.

Pin/Wire #	Function
1	STO-SBC1
2	STO-SBC2
3	Safety Ground
4	RX_N
5	RX_P
6	TX_N
7	TX_P
8	PE

STO/SBC Connections

Wire #	Function
1	STO-SBC1
2	STO-SBC2
3	Safety Ground

Note

On the Y-Splitter cable these wires are open strands at the master side.

EtherCAT Connection

Note

The Pins in the table below are the standard pins of a RJ45 while the red numbers in the image indicate the reference pins of the hybrid connector.

Pin #	Function
1	TX_P
2	TX_N
3	RX_P
4
5
6	RX-N

Instructions for manufacturing the cables

General Cable and Wire Specifications

The cable and its wires should meet the minimum requirements of EtherCAT standards.

Attention

For connecting EtherCAT devices only Ethernet cables that meet the requirements of at least category 5 (Cat5) according to EN 50173 or ISO/IEC 11801 should be used.

• The Distance from the connector to the cable housing shall be 30 mm.

• Shield wires must be protected with a shrink tube or similar.

• Each transition of cable-to-wires must be secured/protected with a shrink tube that is lined with adhesive.This prevents the shrink tube from sliding off.

• All the wires should be of the same length, or as much as possible of the same length, in order to prevent tensions in different wires.

• Wires 4 and 5 must be twisted together according to EtherCAT standards.

• Wires 6 and 7 must be twisted together according to EtherCAT standards.

• Wire 1 shouldn’t be twisted with any other wire.

• Wires 2 and 3 may be twisted, but it is not mandatory.

Attention

The cable should be able to withstand a maximum voltage of 100 V wire-to-wire and wire to shield.

Drive-to-Drive Cable

The Drive-to-Drive cable is used to connect two servo drives.

Cable details

Connector Manufacturer	Connector Part Number	Cable Thickness	Cable Flexibility
JST	GHR-08V-S	As thin as possible while conforming to specs	As thin as possible while conforming to specs

Wire details and pinout

Pin/Wire #	Function	Wire AWG	Wire Twisting	Insulation Voltage
1	STO-SBC1	28	no	100 V wire-to-wire and wire-to-shield
2	STO-SBC2	28	no
3	Safety Ground	28	no
4	RX_N	28	Twisted pair *
5	RX_P	28
6	TX_N	28	Twisted pair *
7	TX_P	28
8	PE	28	shield

*According to EtherCAT standards

Connectorization

Both sides must be provided with this connector: GHR-08V-S from manufacturer JST.

Y-Splitter Cable

The Y-Splitter Cable consists of two cables that are tied together from one side:

• STO/SBC Cable

• EtherCAT Cable

Overview

Cable	Connector Manufacturer	Connector Part Number	Cable Thickness	Cable Flexibility
STO Cable	JST	GHR-08V-S	As thin as possible while conforming to specs	As thin as possible while conforming to specs
EtherCAT Cable	any*	RJ45*

*According to EtherCAT standards

Wire details and pinout

Cable	Function	End Connector 1	Pin #	End Connector 2	Pin/Wire #	Wire AWG	Wire Color	Wire Twisting	Insulation Voltage
STO Cable	STO-SBC1	open wire	1	GHR-08V-S	1	28	red 1	no	100V wire-to-wire and wire-to-shield
	STO-SBC2		2		2	28	black 1	no
	Safety Ground		3		3	28	white 1	no
EtherCAT Cable	RX_N	RJ45	6		4	28	green 2	Twisted pair 3
	RX_P		3		5	28	green-white 2
	TX_N		2		6	28	orange 2	Twisted pair 3
	TX_P		1		7	28	orange-white 2
	PE		shield		8	28		shield

1(1,2,3)

Exemplary (used by Synapticon)

2(1,2,3,4)

According to TIA/EIA 568B

3(1,2)

According to EtherCAT standards.

Connectorization

• Both STO and EtherCAT cables are provided on one side with this connector: GHR-08V-S from manufacturer JST.

• The STO cable has open wires on the other side.

• The EtherCAT cable is connectorized on the other side with standard RJ45 connector.

Insulation Voltage

The cables should be able to withstand a maximum voltage of 100V wire-to-wire and wire to shield.

Cable Thickness and Flexibility

The cable must be as thin and as flexible as possible.