Redundant I/O Modules
Allen‑Bradley

• Offer flexible, modular construction for user-configurable I/O applications
• Provide I/O redundancy for system requiring high availability
• Suitable for simplex and duplex connections and for fault tolerant applications
• Require no additional hardware or programming software
• Allow module removal and replacement online with no interruption of the signal inputs

1715 Analog Input Modules

• Offer 4…20 mA input
• 16-channel connection capability
• Independent, galvanically isolated input channels
• Built-in diagnostic testing

1715 Analog Output Modules

• Offer 4…20 mA output
• Support as many as eight field devices
• Provide secure communication between modules for fault tolerant operation
• Include two-terminal current regulating device

1715 Digital Input Modules

• Offer 24V DC input
• 16-channel connection capability
• Independent, galvanically isolated input channels
• Built-in diagnostic testing
• Provide input voltage data for line monitoring and field fault detection

1715 Digital Output Modules

• Offer 24V DC output
• Eight isolated output channels per module
• Offer fail-safe design and operation
• Provide duplex series output switches with overload protection for each channel
• Provide voltage and current monitoring on each channel with reverse current protection
• Support short circuit and open circuit line fault detection
• Allow dual redundant field power feed capabilities without requiring external diodes