Hirschmann RS20 Basic Switch Installation and Debugging Guide

DC power supply: Operating voltage range of 9.6VDC to 60VDC, rated 12VDC to 48VDC. The two inputs (P1 and P2) are internally decoupled through diodes and have no load balancing function. The system automatically selects the input with higher voltage as the main power supply.

AC power supply: Supports 18VAC to 30VAC (50/60Hz), simply connect the AC cable to the+24V (P1) and 0V terminals (P2 is the same).

Key note: If only a single power supply is used, the device will continuously trigger a "power failure" alarm. The solution is to apply the same voltage to both P1 and P2 simultaneously; ② Turn off the power alarm monitoring function through the management software.

3.3 Logic and use of "FAULT" signal contacts

The signal contact is a normally closed circuit relay, which means that the contact is closed in the normal state and disconnected in case of a fault. The triggering conditions include:

Either power supply voltage is below the threshold;

Equipment self-test failed;

Port link interruption (this monitoring function needs to be enabled through the management interface);

The circular redundant network experienced a chain break.

Electrical limitations: Maximum contact switching capability of 1A (SELV circuit), maximum switching voltage of 60VDC or 30VAC. This contact can be used to send a hard wired alarm to the PLC or upper monitoring system.

Chapter 4: Data Interface Connection and Cable Specification

4.1 10/100BASE-T (X) twisted pair port

Connector: Standard RJ45 socket with LED status indicator light.

Auto negotiation and polarity adaptation: Auto negotiation is enabled by factory default, and supports Auto crossover (MDI/MDI-X automatic recognition) and Auto polarity correction.

Cable requirements: It is recommended to use shielded twisted pair (STP) cables that meet Category 5e or higher standards to suppress electromagnetic interference in industrial environments.

4.2 Fiber Port (Multimode DSC)

Connector type: DSC (Duplex SC) interface, requiring the use of 100Base FX standard multimode fiber.

Transmission parameters: Only supports full duplex mode, with a fixed rate of 100Mbit/s.

Cleaning precautions: Fiber end face contamination is the primary cause of optical link failure and must be treated with specialized cleaning tools. It is strictly prohibited to use alcohol swabs to directly wipe the connected jumper end face.

4.3 Serial Management Interface (V.24)

Physical interface: RJ11 socket (6P4C), non electrically isolated.

Connection parameters: data rate 9600bps, data bits 8, stop bit 1, no parity check, no flow control.

Applicable scenario: When network parameters (IP address) are unknown or DHCP service is unavailable, VT100 terminal can be used for local command-line configuration through this interface.

Chapter 5: Status Indication and Startup Self Test

5.1 Power and System Status LEDs

Meaning of LED identification color status

P (Power) green constant light, both power sources are normal

Yellow constantly on, powered by only one power source

Turn off both power sources below the threshold

The FAULT red constant light signal contact is disconnected, indicating an alarm condition

Extinguish the device normally and close the contacts

5.2 Port Status LED (LS/DA)

LS (Link Status, green):

Always on: Link is valid;

Slow flashing (once/cycle): The port is in Standby state (redundant protocol activated);

Flash (3 times/cycle): The port is managed to be closed.

DA (Data Activity, yellow): Blinking indicates that the port is sending and receiving data frames.

Chapter 6 Initial Power On and IP Address Configuration

6.1 Power on process

After completing all wiring and checking for errors, insert the power terminal block. During the device startup process, the port LED will flash sequentially to indicate the boot phase, lasting for about 30 seconds to 1 minute before entering normal operation.

6.2 Four ways to obtain an IP address

HiDiscovery Protocol: A Windows tool provided by Hirschmann that can discover devices without configured IP within the same broadcast domain and manually assign addresses.

DHCP/BOOTP: enabled by default, sends a Discover request when the device starts.

Autoconfiguration Adapter (ACA 11): A hardware adapter connected through the V.24 interface, used for batch deployment of configuration files and IP addresses.

Local V.24 console: Manually set static IP, subnet mask, and gateway through the command line.

Factory default certificate:

User level (read-only): Login=user, Password=public

Management level (read-write): Login=admin, Password=private

Chapter 7 Mandatory Requirements for Installation in Explosion proof Areas

For projects deployed in chemical, oil and gas environments with combustible gases, RS20 Basic holds ATEX 94/9/EC and IECEx certification (certificate number: DEKRA 11ATEX0139 X). The following special conditions must be observed:

Temperature level T4: The ambient temperature range is strictly limited to 0 ° C to+60 ° C (applicable to "B" models).

Shell protection: The equipment must be installed in a cabinet that meets the requirements of EN 60079-15 and has a protection level not lower than IP54.

Transient overvoltage protection: Measures must be taken to prevent the rated voltage from exceeding 40% due to transient interference (such as lightning strikes).