KEYENCE GL-RHG Series - Manual (Page 27)

2-1 Wiring System
2-3 GL-RHG-M-NO2-E
Fu
nct
ion
s and
Feat
ures
2
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
Tran
smi
tter
Tra
nsmitt
er
Transmit
ter
Re
ce
iv
er
R
ec
eiv
er
Recei
ver