Toa RM-971 - Manual (Page 30)

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8.4. Connection of the Terminal Plate to the Main Rack (JP-0410)
Use shielded, heat-resistant, twisted paired cable for connection.
Connect the JP-0410's front-mounted terminal block and remote control unit's terminal plate.
The maximum cable length between main rack and remote control unit is 800 m. However, the distance may
be shorter than 800 m depending on the type and zone numbers of remote control units.
8.4.1. Maximum line resistance
Zone numbers Power cable (1 pair) Control cable (4 pairs)
10 Under 5
Ω
Under 50
Ω
20 Under 3
Ω
Under 50
Ω
30 Under 2.5
Ω
Under 50
Ω
40 Under 1.5 Ω Under 50 Ω
50 -90 Under 1
Ω
Under 50
Ω
Over 100 Under 0.5
Ω
Under 50
Ω
8.4.2. Multiple remote control units connections
• Be sure to branch individual cables at the main rack when connecting multiple remote control units.
Main Rack
Remote control unit
Remote control unit
Remote control unit
Main Rack Remote control unit Remote control unit Remote control unit
• Up to eight remote control units can be connected. Because the power is supplied from the main rack, the
Expansion DC Power Supply Panel or Emergency Power Supply Panel may have to be additionally
mounted in the main rack. For details, refer to the sections "Emergency Power Supply Panel DS-029B
Connection" and "DC Power Supply Panel Connection" in the Installation Manual - Basic Installation for the
FS-970 Series.