接到環(huán)中它的下一個模塊的接收器上，從而不斷形成-一個通信環(huán)。下圖說明了由4個UR系列保護裝置組成的環(huán),這些保護裝置的連接是:UR1-Tx至UR2-Rx，UR2-Tx至UR3-Rx，UR3-Tx至UR4-Rx，和UR4-Tx至UR1-Rx。一個單環(huán)上最多可連接16個UR系列保護裝置。e)測試模塊(開關85和S6)

HONEYWELL MEASUREX 08667800 RTTC MOTOR ASSEMBLY QCS

2E818 HONEYWELL Fan/Limit Control L4064B2228

HONEYWELL TEMPERATURE CONTROLLER DC3003-0-000-1?-00-0111

HONEYWELL TIME DELAY MODULE FF-SRT052R2

HONEYWELL 70B1G040P101W FNFP 70B1G040P101W

HONEYWELL MN7505A2001 NSFP MN7505A2001

HONEYWELL MP909E-1364 USPP MP909E1364

HONEYWELL T4039M-1004 NSPP T4039M1004

HONEYWELL 2EC04700924 USPP 2EC04700924

HONEYWELL C6097A-1012 NSFP C6097A1012

HONEYWELL MICRO SWITCH FE7C-RPT2V-M IN BOX

Honeywell I/O Rack 621-9990 IPC 621 PLC CLASSIC

HONEYWELL T631F-1001 NSFP T631F1001