Overview
1756-OF8H is an 8-channel HART analog output module of the ControlLogix series. It has 8 mutually isolated output channels and supports multiple signal types, including ±10V, 0-10V voltage signals and 4-20mA, 0-20mA current signals, with a signal resolution of 15-16 bits. At 25℃ and the HART function is turned off, the voltage output accuracy is better than 0.1% of the range, and the current output accuracy is better than 0.15% of the range. Rack mountable, suitable for terminal block housings such as 1756 – TBNH or 1756 – TBSH. The operating temperature range is 0 – 60°C and the storage temperature is – 40°C to 85°C.
Parameter
| Parameter | 1756-OF8H | 1756-OF8 | 1756-OF4 |
|---|---|---|---|
| Module Type | 8-channel HART analog output module | 8-channel analog output module | 4-channel analog output module |
| Output Signal | ±10V DC voltage, 4-20mA/0-20mA current | ±10V voltage, 4-20mA current | ±10V voltage, 4-20mA current |
| Resolution | 15-16 bits | 15 bits (at 21mA range); 15 bits (at 10.4V range) | 15 bits for current (21mA range, 650nA/bit); 16 bits for voltage (10.5V range, 320μV/bit) |
| Core Features | Built-in 1 HART modem, supports HART protocol, enables device status monitoring and parameter debugging | No HART function, with overvoltage and short-circuit protection, supports hot swapping | No HART function, supports data rolling timestamp and fault data multicast, suitable for small-scale control scenarios |
| Backplane Current | 230mA at both 5.1V and 24V | 150mA at 5.1V, 210mA at 24V | 150mA at 5V, 120mA at 24V |
| Isolation Voltage | 50V continuous isolation | 250V, reinforced insulation test of 1350V AC for 2 seconds between output channels and backplane | 50V continuous isolation |
| Power Consumption | Total backplane power consumption: 6.54W | Maximum power consumption: 4.9W (at 60℃ environment) | Maximum power consumption: 4.9W (at 60℃ environment) |
| Compatible Terminal Blocks | 1756-TBNH, 1756-TBSH | 1756-TBNH, 1756-TBSH | 1756-TBNH, 1756-TBSH |
| Application Scenarios | Complex scenarios requiring HART protocol communication, e.g., precise control of intelligent valves and actuators in chemical and energy industries | General analog control scenarios without HART function, e.g., equipment speed regulation in ordinary production lines | Small and medium-sized automation systems, simple analog output scenarios with limited space and no HART function required |
FAQ:
1.All 8 channels of 1756-OF8H support the HART protocol. How much impact will it have on the accuracy and response time of the output signal after turning on the HART function on a single channel?
After the HART function is turned on for a single channel, the impact on the accuracy of 1756-OF8H is negligible, but the current signal response time will be slightly increased:
- Accuracy: HART uses the FSK method to superimpose digital signals without changing the analog signal reference. The accuracy still maintains voltage <0.1% of the range and current <0.15% of the range (25°C).
- Response time: The current signal is extended from <23ms to <37ms; the voltage signal response time has no change (<8.5ms), and the delay meets the real-time requirements of industrial control.
2.1756-OF8H adapts to 1756-TBNH terminal block. Is it compatible with third-party terminal blocks?
1756-OF8H is compatible with some compliant third-party terminal blocks:
- The interface is a 20-pin plug-in type, matching the module pin definition; wire gauge 14-22 AWG, rated voltage 300V, current 10A.
- Mechanical dimensions adapt to the installation space and fixing methods of the 1756 series.
- Compatibility of special models such as Phoenix FLKM 14-PA-AB/1756/EXTC is guaranteed.
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