KYLAND Technology SICOM3000 User manual

SICOM3000 User’s Manual 201001
SICOM3000
Industrial Ethernet Switch
User’s Manual
KYLAND Technology Co., Ltd.

SICOM3000 User’s Manual 201001
SICOM3000 Industrial Ethernet Switch
User’s Manual
Copyright © 2007-2009 KYLAND Technology CO., LTD.
All rights reserved.
No part of this documentation may be excerpted, reproduced, translated, annotated or
duplicated, in any form or by any means without the prior written permission of KYLAND
Corporation.
Publisher: KYLAND Technology CO., LTD.
Address: Chongxin Creative Building, Shixing East Road 18#,
Shijingshan District, Beijing, China
Website: http://www.kyland.cn
Postcode: 100041
Tel: [phone]
FAX: [phone]
E-mail: [email protected]
Version: V1, Jan. 2007
V2, Dec. 2008
V3, May. 2009
No.: 27030007-30

SICOM3000 User’s Manual 201001
Preface
SICOM3000 is a high-performance Gigabit industrial Ethernet switch specially designed by
KYLAND Technology CO., LTD. for industrial applications. Its high-performance switch engine,
solid and sealed case design, single ribbed fanless case for high efficient heat dissipation, over
current and overvoltage protection at power input terminal, and excellent EMC protection of
RJ45 port make SICOM3000 applicable in harsh and dangerous industrial environments. Fiber
network redundancy function and dual redundant power supplies provide multiplex guarantee
for reliable operation of the system.
The user’s manual for SICOM3000 Industrial Ethernet Switch mainly introduces the technical
principles, performance indexes, installation and commissioning, etc. It is a reference for users
in system startup, expansion and routine maintenance. It is also a practical teaching material
for user training and technician study.
This manual mainly includes the following contents:
Chapter 1 Overview and system features of SICOM3000;
Chapter 2 Performance and service functions of SIOCM3000;
Chapter 3 Hardware structure of SICOM3000;
Chapter 4 Installation of SICOM3000;
Chapter 5 Field test methods for SICOM3000;
Chapter 6 Network topology and system configuration of SICOM3000;
Appendix A Introduces twisted pair and pin distribution rules of SICOM3000;
Appendix B Introduces cable types and specifications of SICOM3000;
Appendix C Introduces abbreviations used in this manual.
Statement: As product and technology upgrades and improves constantly, the contents of
this document may not completely accord with the actual product. For product
upgrading information, please visit our company’s website or directly contact with our
business representative.

SICOM3000 User’s Manual 201001
Notice for Safety Operation
This product performs reliably as long as it is used according to the guidance. Artificial damage
or destruction of the equipment should be avoided.
Read this manual carefully and keep it for future reference;
Do not place anything on power cable and put the cable in unreachable places;
Do not tie or wrap the cable to prevent fire.
Power connectors and other equipment connectors should be firmly interconnected
and frequently checked.
In the following cases, please immediately cut off the power supply and contact our company:
1. Water gets into the equipments;
2. Equipment damage or shell breakage;
3. Abnormal operation conditions of equipment or the demonstrated performances have
changed;
4. The equipment emits odor, smoke or makes noise.
Please keep optical fiber plugs and sockets clean. During the operation of equipments, do
not look directly at the cross section of optical fiber;
Please keep the equipment clean; if necessary, wipe the equipment with soft cotton cloth;
Do not repair the equipment by yourself, unless it is clearly specified in the manual.
Explanation of Warning Marks:
This manual uses two kinds of noticeable warning signs to arouse special
attention of users during operation. The implications of these signs are as
follows:

SICOM3000 User’s Manual 201001
Warning: pay special attention to the notes behind the mark, improper
operation will lead to serious damage of the switch or injury of the
operating personnel.
Caution, attention, danger: remind the operators places that need to
pay attention to.

SICOM3000 User’s Manual 201001
Table of contents
CHAPTER 1: SYSTEM OVERVIEW.......................................................................................................................................... 8
1.1 Product Overview ....................................................................................................................................................... 8
1.2 Product Features ......................................................................................................................................................... 8
1.3 Packing list and unpacking check......................................................................................................................... 9
CHAPTER 2: PERFORMANCE SPECIFICATIONS...................................................................................................... - 11 -
2.1 System Specifications .................................................................................................................................... - 11 -
2.2 Service Interface.................................................................................................................................................. - 12 -
2.3 Service Function.................................................................................................................................................. - 13 -
CHAPTER 3: HARDWARE STRUCTURE....................................................................................................................... - 16 -
3.1 System Structure................................................................................................................................................. - 16 -
3.2 Device Structure .................................................................................................................................................. - 16 -
3.2.1 Case............................................................................................................................................................. - 16 -
3.2.2 Front Panel ............................................................................................................................................... - 17 -
3.2.3 Top panel (24VDC, 48VDC) ............................................................................................................... - 20 -
3.2.4 Top panel (110VDC, 220VAC/DC) .................................................................................................. - 22 -
CHAPTER 4: HARDWARE INSTALLATION................................................................................................................. - 25 -
4.1 Installation requirement.................................................................................................................................. - 25 -
4.2 Mainframe installation...................................................................................................................................... - 25 -
4.2.1 DIN-Rail installation............................................................................................................................. - 25 -
4.3 Cable connection................................................................................................................................................. - 26 -
4.4 Optical Fiber Connection ................................................................................................................................. - 26 -
4.5 Cable Wiring.......................................................................................................................................................... - 27 -
CHAPTER 5: TEST METHODS ......................................................................................................................................... - 29 -
5.1 Self inspection ...................................................................................................................................................... - 29 -
5.2 TP Port Test ........................................................................................................................................................... - 29 -
5. 3 Fiber Port Test..................................................................................................................................................... - 29 -

SICOM3000 User’s Manual 201001
CHAPTER 6: NETWORKING AND CONFIGURATION............................................................................................. - 31 -
6.1 Networking............................................................................................................................................................ - 31 -
6.2 System configuration......................................................................................................................................... - 31 -
Appendix A: Twisted-pair and Pin Distribution...................................................................................................... - 33 -
Appendix B: Cable Type and Specifications.............................................................................................................. - 35 -
Appendix C: Glossary................................................................................................................................................................36

SICOM3000 User’s Manual 201001
Chapter 1: System Overview
1.1 Product Overview
SICOM3000 is a high-performance Gigabit industrial Ethernet switch specially designed by
KYLAND Technology CO., LTD. for industrial applications. Its high-performance switch engine,
solid and sealed case design, single ribbed fanless case for high efficient heat dissipation, over
current and overvoltage protection at power input terminal, and excellent EMC protection of
RJ45 port make SICOM3000 applicable in harsh and dangerous industrial environments. Fiber
network redundancy function and redundant power input provide multiplex guarantee for
reliable operation of the system.
SICOM3000 series Gigabit industrial Ethernet switch have strong web-management function
which support CLI, Telnet, WEB, SNMP and OPC-based network management.
SICOM3000 supports two ways of installation: DIN-Rail installation and wall-mounting. It has 2
uplinked redundant pluggable 1000M SFP ports in the front panel, 2 pairs of redundant
100Base-FX, single mode/multi mode, fiber ports or 2 redundant 10/100Base-TX RJ45 ports. It
can form 1000Mbit fiber redundant ring network with the recovery time of less than 50ms, and
can also form redundant 100Mbit fiber or twisted pair ring network with the recovery time of
less than 50ms. SICOM3000 is equipped with 6 10/100Base-T/TX RJ45 ports and each of them
has self-adaptive function, making it automatically configured to 10Base-T/100Base-TX,
full/half duplex mode and MDI/MDI-X auto-connection.
1.2 Product Features
1. High performance industrial Ethernet switch
Pluggable 1000M SFP ports, be used as fiber ports or RJ45 copper ports
2 Gigabit and 2 100M fiber ports, providing flexible network forming methods
Support various management methods for user’s easy management, such as WEB, CLI,
TELNET, SNMP, and OPC.
10/100Base-TX, self-adaptive Ethernet ports (full/half duplex), support auto MDI/MDI-X
connection
100Base-FX full duplex multi mode/single mode redundant fiber ports
The fiber ring network redundancy technology with recovery time of less than 50ms, raising

SICOM3000 User’s Manual 201001
the reliability of system communication
IEEE802.3/802.U/802.3X store and forward
Support IGMP Snooping, port mirroring, port trunking, broadcast storm control, DT-Ring,
DT-Ring+, RSTP, VLAN, ACL, SNMP
802.1P, IP TOS, DSCP priorities
Alarm function
FTP-based online software update, easy for user’s device management and renewal
2. Industrial Power Design
Support industrial power input: 24VDC(18~36VDC), 48VDC(36~72VDC),
110VDC(66~154VDC), 220VAC/DC(132~300VAC/176~400VDC)
Power input with over-current, over-voltage and EMC protection
Redundant power inputs raise the system reliability
3. Rugged design
Single-ribbed aluminum case design for heat dissipation (no fans); reliable operation at -40℃
to +85℃
Solid and sealed aluminum case with IP40 protection class, and is able to work in harsh and
dangerous industrial environments
DIN-Rail and wall-mounting installation
1.3 Packing list and unpacking check
1. Packing list
Please refer to the packing list
2. Unpacking check
Before opening the case, place it stably, pay attention to the direction of the packing case
and ensure its right side is facing upward, so as to prevent SICOM3000 falling from the case
after opening it. If using a hard object to open the case, do not over extend the hard object
into the case to avoid damage of the equipments inside it.
After opening the case, please check the amount of SICOM3000 equipments according to
the packing list and check the appearance quality of SICOM3000.

SICOM3000 User’s Manual 201001
Warning:
For the built-in precise parts of the equipment, please handle with care and avoid strenuous
vibration to avoid affecting the performances of equipments.

Appendix A Twisted-pair and Pin Distribution
Chapter 2: Performance Specifications
2.1 System Specifications
The system performance specifications of SICOM3000 industrial Ethernet switch are shown in
Table 2-1.
Table 2-1 System Specifications
Specifications
SICOM3000
Quantity of RJ45 port
610 /100Base-TX
Quantity of redundant
Gigabit fiber or copper ports
2×1000Base-SFP port
Quantity of redundant
100M fiber or copper ports
2×100Base-FX-SM/MM or 2×10/100Base-TX
System performance
Standards: IEEE802.3, IEEE 802.3x, IEEE 802.3u, IEEE 802.1w,
IEEE 802.1d, IEEE 802.1p, IEEE 802.1q, IEEE 802.3z, IEEE
802.3ab
Store-and-Forward speed: 1488100pps;
Max. filtering speed: 1488100pps
Switching mode: Store-and-Forward
System switching bandwidth: 5.6G
Electromagnetic compatibility interference: EN55022
Electromagnetic compatibility immunity: EN50082-2
TP port parameters
Physical port: shielded RJ45
RJ45 port: 10/100Base-TX, supporting auto-negotiation
Port standard: in line with IEEE802.3 standard
Transmission distance: <100m
Fiber port parameters
Optical power: >-13dbm (SM) >-20dbm (MM)
Receiving sensitivity: <-28dbm (SM) <-35dbm (MM)
Wave length: 1310nm (SM) 1550nm (SM) 1310 nm (MM)
Transmission distance: 40-80km(SM)
<2km (MM) (Gigabit), <5km (MM) (100M)
Connector type: LC, SC/FC/ST
Transmission speed: 1.25Gbps (Gigabit), 125Mbps (100M)
Power supply
Input voltage: dual power input, 24VDC (18~36VDC), 48VDC
(36~72VDC), 110VDC (66~154VDC), 220VAC/DC

SICOM3000 User’s Manual 201001
(132~300VAC/176~400VDC)
Input power consumption: <10W
Over-current Protection: built-in
Mechanical parameters
Physical dimensions (heightwidthdepth): 140 ㎜75 ㎜123
㎜(excluding the dimensions of Din-Rail and wall-mounting
components)
Mounting mode: Din-Rail and Wall mounting
Heat removal method: Single-ribbed aluminum case without
fans.
Outlet type: front outlet for services and top outlet for power,
network management, protection grounding, alarm
Shell protection class: IP40
Weight: 1.2kg
Ambient conditions
Operating temperature: -40℃～85℃
Storage temperature: -40℃～85℃
Humidity: 0～95% (non-condensing）
2.2 Service Interface
1. 6or 8 10/100Base-TX RJ45 ports. Each RJ45 port has self-adaptive function, capable of
automatically configuring between 10Base-T and 100Base-TX, between full duplex and half
duplex mode, supporting MDI/MDI-X auto-connection. The max transmission distance is
100m.
2. 2 pairs of redundant 100Base-FX SM/MM fiber ports and the maximum throughput of each
pair is 100Mbps with compulsory 100M full duplex working mode. Support fiber line
redundancy technology with recovery time of less than 50ms.
3. 2 pairs of redundant 1000Base-LX SM/MM fiber ports or 1000Base-TX RJ45 ports and the
maximum throughput of each pair is 1000Mbps with compulsory 1000M full duplex working
mode. Support line redundancy technology with recovery time of less than 50ms.
4. Comply with IEEE802.3/802.3U/802.3X/802.3Z/ab
5. Meanings of RJ45 ports’ indicators: yellow lamp –rate indicator; on:100M, off: 10M;
green lamp –connection state indicator, on: effective network connection; blink: network
activities; off: no connection. After one minute of all lights on, enter the state described
above.

SICOM3000 User’s Manual 201001
2.3 Service Functions
The service functions of SICOM3000 mainly include:
LED Indicator
The LEDs in front panel of SICOM3000 indicate the port status including transmitting rate, link
status and system status.
Layer-2 Switching
The two commonly used switching technologies: Cut-Through and Store-and-Forward. In
Cut-Through, as soon as the switch receive a frame header, it is immediately forwarded without
any error checking and processing; in Store-and-Forward, after receiving and storing the
complete frame, error checking is conducted before forwarding. Store-and-forward is most
widely used switching technology and it is also adopted by SICOM3000.
VLAN
VLAN will divide a network into multiple logical networks. Data packets cannot be transmitted
between different VLANs so as to control the broadcast domain and segment flow and improve
the network performance, security and manageability. SICOM3000 series supports IEEE802.1q
VLAN tag. It can be divided into up to 4094 VLANs based on ports. The VLAN division can be
realized via WEB, CLI. VLAN Tag packet is transmitted transparently.
QoS function
IEEE 802.1p is the most widely used priority solution in LAN environment. SICOM3000 series
supports 802.1p standard, as well as IP TOS and DSCP priority configurations. When the
terminal connected to SICOM3000 doesn’t support these three priorities and user wants to set
different priorities to services in different ports, this function can be used to do port-based
configuration. This configuration only affects the data packets without priorities in the ports.
Each port of SICOM3000 support 4-level priority configuration (highest, high, low, and lowest).
Port Trunking
SICOM3000 series industrial Ethernet switch can aggregate several physical ports into a logical
port, then these ports have same rate, duplex mode and VLAN ID. Port Trunking can be
configured in a single switch with max 4 Port Trunkings, This function can reduce the network
traffic congestion and enhance fault-tolerance performance.
Port mirroring (Port sniffing)
Be capable of mirroring the data packets in a port to another port for real time monitoring the
communication data.

SICOM3000 User’s Manual 201001
Configure Port Working Modes
SICOM3000 series is able to configure the working mode of all ports through network
management: self adaptive, 10M/half-duplex, 100M/half-duplex, 10M/full-duplex,
100M/full-duplex, etc
Configure Port Traffic Flow
SICOM3000 series can configure the TX and RX rate of all ports via the management software.
For port of 100Mbps, it can be set as 128K, 256K, 512K, 1M, 2M, 10M, 50M, 100M. For Gigabit
port, it can be set as 100M, 500M, and 1000M.
Static Multicast Communication
Adding multicast users by the way of manually adding static multicast table, compared to
dynamic multicast, is more simple, reliable and faster without the need of protocols. The
multicast data can be forwarded by configuring static multicast forwarding tables. Users can
manually configure the multicast communication according to their own requirements. Static
multicast communication cannot be used with IGMP simultaneously.
IGMP
IGMP is Internet Group Multicast Protocol. SICOM3000 series offers IGMP monitoring and query
functions. Data packets can be transmitted to multi necessary host computers and prevent
overloading. It solves the problems of bandwidth occupation when broadcasting.
Broadcast Storm Control
When too much broadcast packets are transmitted in the network, they will take up so much
bandwidth that cause a network timeout. It is called network storm. SICOM3000 support
broadcast data packets, multicast data packets and broadcast storm control and discard the
broadcast data packets that exceed user’s time limit setting.
DT-Ring
DT-Ring is Kyland’s proprietary communication protocol. It determines the state of ring & port
by inspecting the ring port state, so as to ensure the redundant network won’t form a ring and
achieve a fast and reliable Ethernet redundant ring to meet the high requirements of industrial
communications.
DT-Ring+
DT-Ring+, based on DT-Ring, is also Kyland’s proprietary communication protocol which is to
make a backup between two rings and determine ring & port state by the ID of backup device so
as to ensure the redundant network won’t form a ring. This function guarantees a fast and

SICOM3000 User’s Manual 201001
reliable redundant ring to meet high requirements in the field of industrial communication.
RSTP
SICOM3000 has RSTP and STP functions which offer network redundancy protection for the
switch’s network. RSTP can achieve all functions of STP with an extra function of reducing the
delay time from blocking to forwarding in the port in order to resume the network
communication ASAP.
ACL
ACL (Access Control List) use protocols to set the source or target MAC addresses so as to define
the access rules. It can limit the network traffic, enhance network performance and control the
communication flow. ACL is the basic security method to network access.
Alarm Output
Alarm function includes port alarm and ring alarm which can be enabled by management
software. The alarm information is displayed on the network management interface.
SNMP
SNMP（Simple Network Management Protocol）offers a frame structure for low level
network management. SNMP protocol is used widely. Many kinds of networking devices,
software and system adopt it because it is easy to be realized, free, and can be used to control
various devices.
RMON
RMON is a standard monitoring regulation, used to switch the network monitoring data
between network monitors and console system. It offers more selections for network operators
to choose the suitable console and network monitor for special requirements. It is a
supplementation to SNMP function and is especially useful for monitoring and managing LAN.
The purpose of developing RMON is to provide statistic result of information flow and analyze
network parameters so as to work out a comprehensive network diagnoses, plan and regulation.
By RMON, users can do operation among SNMP management stations and monitoring agents.
Furthermore, it can offer a standard for a group of MIB to collect the network statistics which is
not available via SNMP. RMON realizes early network diagnoses by using powerful alarm group,
which allows setting thresholds for key network parameters so as to automatically send alarm
signal to central management console.

SICOM3000 User’s Manual 201001
Chapter 3: Hardware Structure
3.1 System Structure
The hardware structure of SICOM3000 is as Figure 3-1:
switching network
controlling system
FE1~FE6FE7\8G1-G2
POWER
CPU
EMC
Power input
Figure 3-1 Hardware Structure
The system hardware includes:
１.High performance ASIC chip technology is applied in the switching network controlling
system, providing layer two wire-speed forwarding of data packets
２.Fiber ports use optical transceiving modules with stable performance
３.Industrial power supply with over-current, over-voltage and EMC protection
４.All TP ports with EMC protection
3.2 Device Structure
3.2.1 Case
SICOM3000 case is DIN-Rail or wall mounting type structure. The entire unit adopts
six-side-enclosed design with protection class up to IP40. The case’s left and right sides are
made of single-ribbed aluminum, which are a part of the heat dissipation system. The single
ribbed structure doubles the heat dissipation area and the heat generated during the unit’s
working is dissipated into the air with high efficiency via it with the form of radiation and

SICOM3000 User’s Manual 201001
convection, which greatly enhance the high temperature resistance performance of equipment.
Discard the traditional form of axial fan for heat dissipation, reduce power consumption of the
entire unit and increase the stability of the system. The figuration of SICOM3000 case is shown
in Figure 3-2.
Its contour dimension (excluding the dimensions of DIN-Rail and wall mounting components) is
140 ㎜×75 ㎜×123 ㎜,（height ×width×depth）
a. SICOM3000-2GX-8T b. SICOM3000-2GX-2S(M)-6T
Figure 3-2 Case dimensions of SICOM3000 series
Warning: The shell of this switch is a part of the heat dissipation system of the unit. It may
get hot during working, so never touch the shell when the equipment is working to avoid
burning.
3.2.2 Front Panel
SICOM3000 Industrial Ethernet switch’s front panel has 2 Gigabit SFP ports, 2 pairs of 100M
fiber ports, 8 or 6 10/100Base-TX RJ45 ports and indicators showing system and port operation
status. Its structure is shown as Figure 3-3：

SICOM3000 User’s Manual 201001
Figure 3-3 SICOM3000’s front panel
Gigabit SFP ports
SICOM3000 series has 2 Gigabit SFP ports, supporting 2 pairs of redundant 1000Base-LX full
duplex SM/MM ports or 2 1000Base-TX RJ45 ports with the port number G1 and G2. The SFP
ports adopt SFP modules (LC connector for fiber port, RJ45 connector for TP port). Fiber ports
should be used in pairs (TX and RX are a pair). TX port is for transmission, connected to
receiving port RX in another remote switch; RX port is for receiving, connected to the
transmitting port TX in its pair in the same switch. The 2 pairs of redundant 1000Base-LX fiber
ports can form a redundant fiber ring network with the recovery time of less than 50ms, which
effectively increase the reliability of network operation. The SFP modules are shown in the
below Figure 3-4.
a. RJ45 connector b. LC connector

SICOM3000 User’s Manual 201001
Figure 3-4: SFP plugabe modules
Gigabit SFP modules plug and play steps:
There are two breaks on the SFP module with LC connector and one break on the module
with RJ45 connector
Inserting: Inserting the end of module without breaks into the SFP slot in the switch until
you hear a sound.
Pulling out: Put down the handle in the SFP module, forming a 90 degree angle with the
breaks, then use the handle to pull out the SFP module from the SFP slot.
100M fiber ports
SICOM3000 series has 2 pairs of redundant 100Base-FX full duplex SM/MM fiber ports with the
port number 7 and 8, supporting SC/ST/FC connector. Fiber ports should be used in pairs. TX
and RX is a pair. TX port is for transmission, connected to the receiving port RX in another
remote switch; RX port is for receiving, connected to the transmitting port TX in its pair in the
same switch. The 2 pairs of redundant 100Base-FX fiber ports can form a redundant fiber ring
network with the recovery time of less than 50ms, which increase the reliability of network
operation. Meanwhile ports 7 and 8 can be designed to redundant RJ45 copper ports.
Ethernet RJ45 ports
SICOM3000 series has 6 10/100Base-TX Ethernet RJ45 ports with port numbers 1 to 6. Each of
them has self-adaptive function, supporting MDI/MDI-X auto-connection. They can be
connected to terminal equipments, severs, hubs or other switches by straight-through or
cross-over cables. Each port supports IEEE802.3x self adaptation, so the most suitable
transmitting mode (full/half duplex) and data transmitting rate (10Mbps/100Mbps) can be
automatically selected. If the devices connected to these RJ45 ports do not support
self-adaptation, these ports will transmit data at suitable rate and the transmitting mode is
default as half duplex.
LED indicators
The LED indicators in the front panel of SICOM3000 can indicate system operation status and

SICOM3000 User’s Manual 201001
port status in order to find and settle faults. Table 3-1 shows the meanings of LEDs in the front
panel.
Table 3-1 LED indicators
LED
State
Description
system status LEDs
RUN1
Blinking 1Hz
Switch operates normally, G1, G2 are set as slaves
Blinking 4Hz
Switch operates normally, G1, G2 are set as masters
OFF
Switch does not operate
RUN2
Blinking 1Hz
Switch operates normally, port 7 and 8 are set as slaves
Blinking 4Hz
Switch operates normally, port 7 and 8 are set as master
POWER1
ON
POWER1 is connected and operates normally.
OFF
POWER1 is not connected or operates abnormally.
POWER2
ON
POWER2 is connected and operates normally.
OFF
POWER2 is not connected or operates abnormally.
Gigabit fiber port status LEDs (fiber ports G1 and G2)
LINK/ACT
On
Effective network connection in the port
Blinking
Network activities in the port
Off
No effective network connection in the port
100M fiber port status LEDs（fiber ports 7 and 8）
LINK/ACT
On
Effective network connection in the port
Blinking
Network activities in the port
Off
No effective network connection in the port
Ethernet RJ45 port status LEDs
Each RJ45 Ethernet port has two indicators, a yellow lamp and a green lamp. The yellow
lamp indicates port rate, and the green lamp indicates port connection state.
10M/100M
(Yellow)
On
100M working state（i.e. 100Base-TX）
Off
10M working state (i.e. 10Base-T）
LINK/ACT
（Green）
On
Effective network connection in the port
Blinking
Network activities in the port
Off
No effective network connection in the port
3.2.3 Top panel (24VDC, 48VDC)
The top panel of SICOM3000 industrial Ethernet switch has two power input terminals for
power redundancy, relay alarm output terminal, grounding protection terminal, etc. Its structure
is as figure 3-6.