1756-OF4 - 4-Channel ±10 V/0–20 mA AO Module | Allen-Bradley
Teilenummer: 1756-OF4 ✓ Aktiv| Menge | Stückpreis | Gesamt |
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| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
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| 500 | $0 | $0,00 |
| 1.000 | $0 | $0,00 |
1756-OF4 Übersicht
An analog output module is an industrial programmable-controller I/O device that converts controller data into continuously variable voltage or current signals. It sits between the ControlLogix controller and field equipment in the hierarchy of industrial automation: PLC system, programmable automation controller, I/O module, and analog output interface.
The module provides four selectable outputs, 15-bit resolution, scaling, calibration, ramping, clamping, configurable program and fault states, and open-circuit detection for current outputs. Verified distributor data identifies 0–20 mA current operation, ±10 VDC voltage operation, and a 20-pin open-style format. A service-manual source additionally specifies 650 nA per bit across 21 mA for current output and 320 µV per bit across 10.5 V for voltage output.
The ControlLogix backplane connection and removable terminal block support modular cabinet installation. Published operating temperature data spans 0°C to 60°C, while the module draws 150 mA at 5.1 VDC or 120 mA at 24 VDC from the backplane. Series B and C hardware has higher power requirements than Series A, an important replacement-planning consideration.
Typical uses include proportional control valves, variable-speed drives, positioning equipment, current-loop transmitters, and test systems. Voltage outputs suit drives and positioners accepting bipolar analog commands; current outputs support two-wire process transmitters and provide open-circuit fault detection.
Before installation, verify the ControlLogix chassis, controller compatibility, module series, terminal-block wiring, output mode, grounding, and field-device loop resistance. Keep voltage and current wiring distinct and configure output behavior for safe process states during controller faults or disconnects.
This page consolidates verified manufacturer and distributor specifications, sourcing links, technical comparisons, and engineering guidance. Because no verified drop-in replacement was found, it does not present unverified substitutes or cross-brand modules as pin-compatible alternatives.
Drop-in-Alternativen für 1756-OF4 – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
Für dieses Produkt sind keine Drop-in-Alternativen verfügbar.
Alternativen anfordern1756-OF4 Spezifikationen (herstellerveröffentlicht)
| Product Type | ControlLogix analog output module |
| Number of Analog Output Channels | 4 channels |
| Voltage Output Range | ±10 VDC |
| Current Output Range | 0–20 mA |
| Output Resolution | 15 bit |
| Current Output Resolution | 650 nA/bit across 21 mA |
| Voltage Output Resolution | 320 µV/bit across 10.5 V |
| Isolation | Non-isolated outputs |
| Ausgangstyp | Single-ended voltage/current |
| Terminal Connector | 20-pin removable terminal block |
| Enclosure Style | Open style |
| Betriebstemperatur | 0°C to 60°C |
| Backplane Current at 5.1 VDC | 150 mA |
| Backplane Current at 24 VDC | 120 mA |
| Current Output Fault Detection | Open-circuit detection |
| Output Configuration Features | Scaling, calibration, ramping, clamping, and configurable program/fault states |
| Platform | Allen-Bradley ControlLogix |
| Product Weight | 0.75 lb |
| Warranty | 2 years |
1756-OF4 Schnittstellen & Anschlüsse
Für 1756-OF4 ist keine vom Hersteller veröffentlichte Schnittstellenliste verfügbar. Details zu Anschlüssen und Headern finden Sie in der Herstellerdokumentation.
Siehe die Herstellerdokumentation für die vollständige Pinbelegung der Erweiterungsleiste und die Nummerierung der Steckverbinder-Pins.
Leistungs- und thermische Eigenschaften
| Betriebstemperatur | 0°C to 60°C |
Vom Hersteller veröffentlichte Leistungs- und thermische Parameter für 1756-OF4.
Typische Anwendungen
1756-OF4 ist geeignet für 6 Anwendungs: Proportional Control Valve Positioning, Variable-Speed Drive Speed Reference, Current-Loop Process Transmitter Control, Positioning Axis Command Interface, Industrial Test and Calibration Systems, Machine Tool and Packaging Line Control.
Proportional Control Valve Positioning
The Allen-Bradley 1756-OF4 fits process systems that command proportional valves from a ControlLogix controller. Its four channels can provide ±10 VDC to compatible bipolar valve amplifiers or 0–20 mA to current-input actuators, while scaling and ramping help convert controller values into controlled valve movement. Non-isolated outputs require careful common-reference wiring. Before energizing an actuator, configure program and fault states, verify the field-device limits, and confirm polarity to avoid unexpected full-scale travel.
Empfohlen
Variable-Speed Drive Speed Reference
The 1756-OF4 is appropriate when a ControlLogix system must send a continuous speed command to a compatible variable-frequency drive. Each of its four outputs can use ±10 VDC voltage control, and the documented 15-bit resolution supports fine command granularity. Engineering must match output scaling to the drive's minimum and maximum reference inputs. Configure safe fault values, check common grounds, and test polarity at low command values before enabling full motor-start authority.
Empfohlen
Current-Loop Process Transmitter Control
A ControlLogix installation can use the 1756-OF4's 0–20 mA outputs to drive compatible current-input field equipment when four loops must be controlled from one module. Current-loop wiring simplifies signal referencing, and the verified documentation lists open-circuit detection for current outputs. The module is non-isolated, so common-point effects must be evaluated. Confirm loop resistance, shield grounding, channel calibration, and disconnect behavior against the connected transmitter or controller datasheet.
Empfohlen
Positioning Axis Command Interface
The 1756-OF4 can translate ControlLogix position commands into analog velocity, speed, or position-reference signals for a compatible positioning controller. Voltage outputs provide bipolar command capability over ±10 VDC, while scaling maps controller engineering units to the axis interface. The four-channel arrangement can serve several axes or axes with redundant commands where system architecture permits. Calibrate each channel, define failsafe outputs, and verify that motion limits remain independent of analog-command scaling.
Empfohlen
Industrial Test and Calibration Systems
The 1756-OF4 is useful in automated test fixtures that need programmable bipolar voltage or current injection into an instrument under test. Four channels allow sequential or parallel stimulus generation where the test architecture permits. Because the outputs are non-isolated, grounding relationships may prevent testing isolated devices simultaneously. Establish safe voltage and current limits, configure output ramps and clamp values, verify polarity, and include interlock hardware before the module drives external test equipment.
Empfohlen
Machine Tool and Packaging Line Control
Machine-tool and packaging systems can use the 1756-OF4 to command proportional axes, pressure valves, or other analog actuators under ControlLogix supervision. Its 0°C to 60°C operating range and four output channels suit compact industrial I/O cabinets when ventilation and enclosure temperature are controlled. Series matters because Series B and C hardware consumes more power than Series A. Commissioning should include channel identification, full-scale checks, fault-state simulation, grounding verification, and controlled emergency-stop validation.
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Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für 1756-OF4 – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt |
|---|---|
| Brand | Allen-Bradley |
| Package | Open-style ControlLogix module with 20-pin removable terminal block |
| Product Type | Analog output module |
| Number of Analog Output Channels | 4 channels |
| Voltage Output Range | ±10 VDC |
| Current Output Range | 0–20 mA |
| Output Resolution | 15 bit |
| Output Isolation | Non-isolated |
| Operating Temperature | 0°C to 60°C |
| Backplane Current at 5.1 VDC | 150 mA |
| Backplane Current at 24 VDC | 120 mA |
| Current-Output Diagnostics | Open-circuit detection |
Designhinweise
Include the module in the chassis power-budget calculation using 150 mA at 5.1 VDC or 120 mA at 24 VDC, as applicable to the installed ControlLogix system. Rockwell states that Series B and C 1756-OF4 modules require more power than Series A modules. Check the exact module series, controller, chassis supply voltage, and all installed modules before maintenance; replacing an older revision with a newer high-power series can exceed an original supply design margin.
Install the 1756-OF4 only in a compatible ControlLogix chassis and use the correct 20-pin removable terminal block. Map each voltage or current channel individually and verify polarity before energizing outputs. Because the outputs are non-isolated, establish whether field devices share a common reference and avoid introducing unintended ground loops. Route command wiring away from high-energy motor and switching circuits where practical.
Do not treat 1756-OF4K software-profile support as proof of drop-in hardware equivalence. Similarly, an eight-channel 1756-OF8 or a generic cross-brand analog module is not a pin-compatible replacement merely because it supports voltage and current outputs. A safe replacement review must cover chassis backplane, terminal mapping, channel isolation, output range, resolution, fault behavior, environmental limits, controller configuration, and lifecycle support.
Compliance-Informationen
The supplied sources do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. The module is industrial programmable-controller hardware rather than an automotive electronic component.