Product Description
Allen-Bradley 1756-TBCH AC Digital I/O Module
The Allen-Bradley 1756-TBCH is an AC Digital I/O Module designed for industrial automation systems, providing high-voltage digital input capabilities with individually isolated channels.
Technical Specifications
Input Characteristics
| Attribute | Specification |
|---|---|
| Inputs | 16 individually isolated |
| Voltage Category | 240V AC, 50/60 Hz |
| Operating Voltage Range | 159–265V AC, 47–63 Hz |
| Nominal Input Voltage | 240V AC, 50/60 Hz |
| Input Delay Time (Screw to Backplane) |
Off to On: 10 ms max + filter time (User-selectable: 1 ms or 2 ms) On to Off: 8 ms max + filter time (User-selectable: 9 ms or 18 ms) |
| Current Draw | 100 mA @ 5.1V 3 mA @ 24V |
| Total Backplane Power | 0.58 W |
| Power Dissipation (Max) | 5.8 W @ 60°C (140°F) |
| Thermal Dissipation | 19.78 BTU/hr |
| Off-State Voltage (Max) | 40V |
| Off-State Current (Max) | 2.5 mA |
| On-State Current |
Min: 5 mA @ 159V AC, 60 Hz Max: 13 mA @ 265V AC, 60 Hz |
| Inrush Current (Max) | 250 mA |
| Input Impedance (Max) | 20.38 kΩ @ 265V AC, 60 Hz |
Electrical and Functional Properties
| Parameter | Value |
|---|---|
| Cyclic Update Time | 200 µs – 750 ms |
| Change of State | Software configurable |
| Timestamp of Inputs | ±200 µs |
| Isolation Voltage | 250V (continuous), basic insulation type, input-to-backplane, and input-to-input |
| Module Keying | Electronic, software configurable |
| Removable Terminal Block Housing | 1756-TBCH, 1756-TBS6H |
| RTB Keying | User-defined mechanical |
| Slot Width | 1 |
| Wire Category |
Signal Ports: Category 1 Power Ports: Category 1 |
| Enclosure Type | None (open-style) |
| North American Temperature Code | T4 |
Environmental Specifications
| Attribute | Specification |
|---|---|
| Operating Temperature | 0–60°C (32–140°F) |
| Non-Operating Temperature | -40 to +85°C (-40 to +185°F) |
| Relative Humidity | 5–95% (non-condensing) |
| Vibration Resistance | 2 g @ 10–500 Hz |
| Shock Resistance (Operating) | 30 g |
| Shock Resistance (Non-Operating) | 50 g |
Electromagnetic Compliance & Immunity
| Parameter | Compliance Standard | Specification |
|---|---|---|
| Emissions | IEC 61000-6-4 | - |
| ESD Immunity | IEC 61000-4-2 |
6 kV (contact discharges) 8 kV (air discharges) |
| Radiated RF Immunity | IEC 61000-4-3 |
10V/m with 1 kHz sine wave 80% AM (30–1000 MHz) 10V/m with 200 Hz 50% Pulse 100% AM at 900 MHz |
| EFT/B Immunity | IEC 61000-4-4 | ±4 kV at 5 kHz on signal ports |
| Surge Transient Immunity | IEC 61000-4-5 | ±1 kV line-line (DM) ±2 kV line-earth (CM) on signal ports |
| Conducted RF Immunity | IEC 61000-4-6 | 10V rms with 1 kHz sine wave 80% AM (150 kHz–80 MHz) |