Description
Description
The Allen-Bradley 1756-OB16IEFS is a high-performance, digitally isolated, scheduled DC fast output module designed for the ControlLogix 1756 chassis platform. This module is engineered for precision timing applications, serving as the primary solution for executing Motion Axis Output Cam (MAOC) instructions in remote chassis configurations. By utilizing CIP Sync Time, the module provides deterministic output control with scheduling intervals as low as 5 microseconds, making it essential for high-speed industrial processes such as flying shears, rotary packaging, and automated glue extrusion.
Features
- 16 independently isolated, source/sink DC output channels.
- CIP Sync slave-only device for time-stamped output scheduling.
- Integrated electronic fusing per point for enhanced circuit protection.
- Supports high-accuracy Pulse Width Modulation (PWM) with configurable duty cycles.
- Hot-swappable design allows for module replacement without removing field wiring when paired with a compatible Removable Terminal Block (RTB).
- Programmable fault states including Hold Last State, ON, or OFF.
Applications
This module is ideal for time-critical automation tasks requiring microsecond-level synchronization. Typical applications include:
- High-speed bottling and sortation systems.
- Rotary packaging knives and cutting machinery.
- Flying shear and synchronized motion control.
- Precision glue extrusion and application systems.
Technical Specifications
| Parameter |
Specification |
| Model |
1756-OB16IEFS |
| Voltage Category |
12/24 VDC |
| Operating Voltage Range |
10 to 30 VDC |
| Number of Outputs |
16 (Isolated) |
| Min. Scheduling Interval |
5 microseconds |
| Unscheduled Output Delay |
14 microseconds (nominal) |
| Backplane Power Consumption |
1.7 Watts |
| Max. Module Power Dissipation |
3.6 Watts @ 60 deg C |
| Isolation Voltage |
250 V continuous |
| Compatible RTB |
1756-TBCH, 1756-TBS6H |
Installation Guidelines
- Ensure the ControlLogix chassis is powered down before inserting or removing the module to prevent electrical arcing or backplane damage.
- The module occupies one standard slot in the 1756 chassis.
- Use only compatible 1756-TBCH or 1756-TBS6H Removable Terminal Blocks for field wiring.
- Maintain proper grounding practices for the chassis to minimize EMI interference, especially in high-speed motion applications.
- Ensure adequate ventilation around the chassis to maintain operating temperatures within the specified limits, as power dissipation can reach 3.6 Watts.
- Handle with ESD-safe precautions to protect internal circuitry.
FAQ
Q: Can this module be used in a remote chassis?
A: Yes, the 1756-OB16IEFS is specifically designed to function in a remote chassis while executing MAOC instructions and receiving output data echoes.
Q: What is the minimum PWM cycle time?
A: The module supports a minimum PWM cycle time of 1 millisecond.
Q: Does this module require a specific terminal block?
A: Yes, it requires a 1756-TBCH (cage clamp) or 1756-TBS6H (spring clamp) Removable Terminal Block for field wiring connections.
