Owner's manual

2-1 Wiring System

2-3

GL-RHG-M-NO2-E

Functions and Features

Series connection

Up to three GL-RHG units can be serially connected and used as a single light curtain. The series con-

nection is available in all wiring system. The series connection cables that KEYENCE provides as an

optional part. ( "Series connection cable" (page 1-3))

 Benefits

• Prevents light interference between the connected GL-RHGs

• Simplified wiring

 Limitations

• Up to 3 units

• Up to 240 total number of beam axes (Up to 228 total number of beam axes when channel A or B is set

by selecting the optical synchronization system)

• When one-line wiring system is applied, the total length of unit connection cable, extension cable and

series connection cables must be 30 m or less.

"1-2 Part Description" (page 1-8)

"4-4 Cable Specification" (page 4-6)

Point

• Series connection is required for secure light interference prevention. When not connecting

the GL-RHG units in series, install the units by referring to "Light Interference

Prevention Method" (page 3-11)

• If the response time (ON  OFF) exceeds 20 ms, this unit cannot be used as a certified

product based on the Chinese standard GB 4584 "压力机用光电保护装置技术条件".

"Response time (OSSD)" (page 7-5)

Example of use with 3 units in series connection

Series connection

cable

Series connection

cable

Unit connection cable

Sub unit 2

Sub unit 1

Main unit

Transmitter Transmitter Transmitter

Receiver Receiver Receiver