Allen-Bradley 1771-ACN15 ControlNet Adapter Module
The Allen-Bradley 1771-ACN15, also cataloged as the 1771-ACN15 Communication Interface Module, operates as a dedicated hardware component for high-speed deterministic remote I/O link processing within ControlNet network architectures. It enables direct physical and protocol interfacing between a central programmable controller and remote 1771 Universal I/O chassis over a single coaxial cable media system.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-ACN15 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 1.98 lbs (0.90 kg) |
| Dimensions | Standard 1771 Single-Slot Module |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 1.0 A at 5 VDC (Backplane Current) |
| Network Protocol | ControlNet 1.5 and beyond |
| Media Interface | Single-Port Non-Redundant BNC Coaxial |
| Communication Rate | 5 Mbps |
| Backplane Isolation | 500 VAC continuous galvanic isolation |
Backplane Bus & Deterministic Communications
The module handles high-speed frame translation between the standard 1771 parallel backplane bus and the ControlNet field network. Operating over deterministic token-passing protocol layers at 5 Mbps, the 1771-ACN15 routes scheduled I/O data transfers and unscheduled message packets without backplane traffic collisions. On-board processor logic continuously manages I/O image table updates across local 1771 I/O slots while maintaining synchronization with the master PLC controller node.
Frequently Asked Questions
Q: What is the backplane current draw for the 1771-ACN15 module during continuous operation?
A: The module draws a maximum backplane current of 1.0 A at 5 VDC from the local 1771 chassis power supply.
Q: Does the 1771-ACN15 support dual redundant ControlNet coaxial media connections?
A: No, the 1771-ACN15 is configured strictly for single-port non-redundant media connections using a single BNC tap interface.
Q: What keying pin positions are required on the 1771 chassis backplane for this adapter?
A: Plastic keying bands must be positioned between pins 4 and 6, and between pins 22 and 24 on the backplane connector to ensure proper module alignment and prevent incorrect module insertion.
Field Installation Guidelines
- Power Isolation: De-energize the 1771 chassis power supply prior to inserting or removing the communication adapter module from the left-most adapter slot.
- Backplane Keying Verification: Confirm that plastic keying bands are securely installed between pins 4-6 and 22-24 on the chassis backplane card connector.
- Coaxial Cable Connection: Connect the RG-6 coaxial cable trunkline tap to the front BNC port using standard 75-ohm BNC connectors and hand-tighten the bayonet lock.
- Node Address Selection: Set the network node address via the rotary switches located on the side panel of the module before sliding the unit into the chassis slot.
- Grounding Protocols: Ensure the coaxial cable shield is grounded at the tap location according to standard ControlNet media isolation guidelines to eliminate differential voltage potential.
Allen-Bradley 1771-ACN15 ControlNet Adapter Module
Allen-Bradley 1771-ACN15 ControlNet Adapter Module
The Allen-Bradley 1771-ACN15, also cataloged as the 1771-ACN15 Communication Interface Module, operates as a dedicated hardware component for high-speed deterministic remote I/O link processing within ControlNet network architectures. It enables direct physical and protocol interfacing between a central programmable controller and remote 1771 Universal I/O chassis over a single coaxial cable media system.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-ACN15 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 1.98 lbs (0.90 kg) |
| Dimensions | Standard 1771 Single-Slot Module |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 1.0 A at 5 VDC (Backplane Current) |
| Network Protocol | ControlNet 1.5 and beyond |
| Media Interface | Single-Port Non-Redundant BNC Coaxial |
| Communication Rate | 5 Mbps |
| Backplane Isolation | 500 VAC continuous galvanic isolation |
Backplane Bus & Deterministic Communications
The module handles high-speed frame translation between the standard 1771 parallel backplane bus and the ControlNet field network. Operating over deterministic token-passing protocol layers at 5 Mbps, the 1771-ACN15 routes scheduled I/O data transfers and unscheduled message packets without backplane traffic collisions. On-board processor logic continuously manages I/O image table updates across local 1771 I/O slots while maintaining synchronization with the master PLC controller node.
Frequently Asked Questions
Q: What is the backplane current draw for the 1771-ACN15 module during continuous operation?
A: The module draws a maximum backplane current of 1.0 A at 5 VDC from the local 1771 chassis power supply.
Q: Does the 1771-ACN15 support dual redundant ControlNet coaxial media connections?
A: No, the 1771-ACN15 is configured strictly for single-port non-redundant media connections using a single BNC tap interface.
Q: What keying pin positions are required on the 1771 chassis backplane for this adapter?
A: Plastic keying bands must be positioned between pins 4 and 6, and between pins 22 and 24 on the backplane connector to ensure proper module alignment and prevent incorrect module insertion.
Field Installation Guidelines
- Power Isolation: De-energize the 1771 chassis power supply prior to inserting or removing the communication adapter module from the left-most adapter slot.
- Backplane Keying Verification: Confirm that plastic keying bands are securely installed between pins 4-6 and 22-24 on the chassis backplane card connector.
- Coaxial Cable Connection: Connect the RG-6 coaxial cable trunkline tap to the front BNC port using standard 75-ohm BNC connectors and hand-tighten the bayonet lock.
- Node Address Selection: Set the network node address via the rotary switches located on the side panel of the module before sliding the unit into the chassis slot.
- Grounding Protocols: Ensure the coaxial cable shield is grounded at the tap location according to standard ControlNet media isolation guidelines to eliminate differential voltage potential.
