TTL Digital Output Module
Allen-Bradley
1771-OG
USA
12 Months
| Minimum Order Quantity | 1 Piece |
| Price | Contact for Jim |
| Packaging Details | Original new Factory Sealed |
| Delivery Time | 3–7 Days |
| Payment Terms | T/T |
| Shipping Method | DHL / FedEx / UPS / TNT |
| Supply Ability | In stock |
| Model Number | 1771-OG |
| Number of outputs | 8 |
| High-level output voltage | 2.0 to 5.25 V DC |
| Low-level output voltage | -0.2 to +0.8 V DC |
| Maximum sourcing current | 1 mA |
| Maximum sinking current | 20 mA |
| External TTL supply voltage | 5 V DC (+0.25 V) |
| Maximum supply ripple | 50 mV peak-to-peak |
| External supply current per module | 250 mA maximum |
| Backplane current requirement | 168 mA maximum |
| Output signal delay | Less than 1 ms |
| Power dissipation | 0.8 to 2.2 W |
| Thermal dissipation | 2.7 to 7.5 BTU/hr |
| Isolation test | 1,500 V AC rms for 1 second |
| Operating temperature | 0 to +60 °C |
| Storage temperature | -40 to +85 °C |
| Relative humidity | 5 to 95%, noncondensing |
| Maximum stranded conductor size | 14 AWG (2 mm²) |
| Maximum conductor insulation thickness | 3/64 in. (1.2 mm) |
| Maximum cable length per output device | 50 ft (15.24 m) |
| Specified signal cable | Shielded Belden 8761 |
| Conductor routing category | Category 2; low-power DC I/O |
| Internal pull-up resistance | 1 kΩ, pulled up to 5 V |
| Wiring-arm screw torque | 7 to 9 lb-in |
| Backplane keying positions | Between 6 and 8; between 10 and 12 |
| Output terminal numbering | 0 through 7 |
| Field supply terminal assignment | A: +5 V DC; 8: DC common |
| Logic selection switch SW1 | ON: HIGH = TRUE; OFF: LOW = TRUE |
| Output circuit configuration | Open-collector with internal pull-up |
| Module mounting interface | 1771 I/O chassis |
| Sales | Phone/Whatsapp | |
| Jim Pei | [email protected] | +86 18020776782 |
Allen-Bradley 1771-OG is an eight-channel TTL digital output module for the 1771 I/O chassis. Its output circuits provide a low-level interface between the programmable controller and compatible TTL input devices. Each channel can source up to 1 mA or sink up to 20 mA. A separate 5 V DC field supply powers the TTL signal circuits, while the chassis backplane powers the module electronics. The output signal delay is less than 1 ms.
The 1771-OG supports maintenance of legacy control installations that use TTL-level output signaling. Internal switches let the installer match the logic convention to the receiving equipment. Logic-side indicators help identify the commanded output state during commissioning and troubleshooting. The removable field wiring arm allows the module to be replaced while retaining the connected field conductors. Check the existing chassis keying, supply polarity and field wiring before installing replacement hardware.
Each output uses an open-collector circuit with an internal pull-up resistor. The separate field supply provides the TTL signal power, while the chassis backplane supplies the module electronics.
The internal logic switch selects whether a high or low output level represents the true state. This lets the output logic match the receiving TTL equipment.
Output commands reach compatible TTL inputs through shielded signal wiring. The insulated return conductor connects the field supply common to the wiring-arm common to complete the signal path.
It is a TTL interface, not a general-purpose power output. The connected device must meet the published TTL interface requirements.
No. Turn off power to the chassis backplane and field wiring arm before installation or removal.
Please confirm the quoted scope. The matching field wiring arm is 1771-WC; accessories are included only when expressly listed.
The output indicators can appear dim when the output signals pulse rapidly. Check the commanded signal behavior during troubleshooting.
We provide actual-item photos and condition or inspection details. A 12-month warranty applies under the agreed sales terms.
For confirmed in-stock goods, we arrange dispatch immediately after payment is received and provide courier tracking. Delivery normally takes 3-7 days.
Company was founded in Xiamen, Fujian, China, in 2005 with a team of only four people. At that time, we mainly served selected European and North American markets, supplying commonly requested industrial automation products from Siemens, Allen-Bradley and Bently Nevada. Although the business was still developing and we completed relatively few orders, this period helped us build essential product knowledge and international trade experience.
By 2017, our team had grown to approximately 30 people, and we had established a warehouse for in-stock automation components. Our business expanded across Europe, North America and Southeast Asia, while our product range grew from popular models to scarce and discontinued industrial automation parts. As our product knowledge and service experience increased, we completed nearly 20 orders per month on average.
Today, Company serves customers worldwide with a professional team of approximately 60 people. Our warehouse holds a broad selection of industrial automation components, including popular products, hard-to-find parts and discontinued models. We now complete more than 30 orders per month, with an average monthly transaction value of approximately USD 3 million. We have established long-term partnerships with nearly 30 customers from different countries and welcomed almost 40 international customers to visit our company.
Since our company was founded, we have served every customer with sincerity and professionalism. Our prices may not always be the lowest, but we earn long-term trust through quality products, dependable after-sales support, honest condition reporting, timely communication and responsible delivery. Our goal is to build lasting partnerships rather than pursue one-off transactions.
We supply leading automation brands covering PLCs, DCS, I/O modules, drives, motors, power supplies, communication modules, and more.
Our experienced team provides reliable pre-sales and after-sales support, helping customers select suitable products and resolve purchasing concerns.
Relevant datasheets and technical literature can be provided with the goods, offering useful information for product identification, installation, operation, and maintenance.
We understand the importance of minimizing equipment downtime. Our team responds promptly to inquiries and provides professional assistance with product information, quotations, order status, shipping, and after-sales questions.
Most products are covered by a warranty of up to 12 months, subject to the applicable terms and conditions. If any product-related issue occurs during the warranty period, our team will assist you and provide an appropriate solution.
We continue to source discontinued, obsolete, and hard-to-find automation parts from various brands, helping customers maintain existing equipment and reduce downtime caused by spare parts shortages.
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