PLC-5 Backup Communication Module
| Sales | Phone/Whatsapp | |
| Jim Pei | [email protected] | +86 18020776782 |
| Model Number | 1785-BCM/C |
| Hardware series | C |
| Backplane voltage | 5 V DC |
| Backplane current | 1 A |
| Switched communication networks | 2 |
| Network types | DH+ or Universal Remote I/O |
| Backup transfer time | Less than 50 ms for control of the supported network links |
| Customer relay rating | 0.25 A at 24 V DC, resistive |
| Installation location | Local 1771 I/O chassis |
| Operating temperature | 0-60 °C |
| Storage temperature | -40 to +85 °C |
| Relative humidity | 5-95%, noncondensing |
| Operating shock | 30 g peak; 11 ±1 ms duration |
| Non-operating shock | 50 g peak; 11 ±1 ms duration |
| Vibration withstand | 1 g at 10-500 Hz |
| 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 | Brand new, In stock |
Allen-Bradley 1785-BCM/C is a Series C PLC-5 backup communication module. It switches two supported DH+ or Universal Remote I/O communication links between primary and secondary controller systems. The module draws 1 A from the 5 V DC backplane. It is installed in the local 1771 I/O chassis. A high-speed serial link keeps the secondary processor system updated.
The 1785-BCM/C supports a duplicated PLC-5 control arrangement with a backup module in each processor chassis. Each processor system uses its own power supply. If the primary processor or its supply fails, the secondary system can continue control of the remote I/O. Backup expansion is required where additional supported network links must be switched. Confirm the installed processor arrangement, channel assignments and backup configuration before replacing a module.
Coordinate supported PLC-5 processor systems so network control can transfer from the primary system to the secondary system.
Maintain the supported remote-I/O control arrangement while a faulted primary processor or its power supply is replaced.
Combine the backup communication module with the required expansion arrangement when the installation switches additional DH+ or Universal Remote I/O links.
The backup communication module switches two supported links. A backup-expansion module is required for the additional pair of links.
It describes transferring control of the supported DH+ and Universal Remote I/O links from the primary processor system to the secondary system after fault detection. It is not a guarantee of every machine process response.
The backup module belongs in the local processor chassis. Each processor system in the backup pair has its own local module.
The intended backup arrangement lets the secondary processor continue remote-I/O control while the faulted primary processor or power supply is replaced. Follow the system maintenance procedure.
Each processor is installed in its own local chassis with its own backup module and power supply. Preserve that duplicated arrangement when planning the system.
The high-speed serial link updates the secondary processor system. The DH+ and Universal Remote I/O links are the external communication paths whose control is switched between the processors.
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.
Our team members have an average of more than 10 years of industry experience. We have worked with customers worldwide, including those from India, Germany, Sweden, Italy, Russia, Venezuela, Israel, and many other countries. Throughout our careers, we have collectively completed over 3,000 orders and established long-term business relationships with customers across nearly 30 countries.
We can often identify a product’s manufacturer, series, configuration, and function from its model number or nameplate photo. We also understand how revisions, firmware, and specifications affect compatibility and whether an alternative model can be used safely.
An Indian customer urgently needed a discontinued control module after several suppliers reported no stock. We identified its exact revision and function from the nameplate, checked compatible alternatives, and contacted factory and warehouse channels to locate matching inventory. After installation, the customer confirmed that the module operated correctly and later asked us to source additional spare parts.
Our team treats every inquiry sincerely and answers every question patiently. Even for complex requests, we verify and respond to each detail instead of providing a rushed or uncertain answer.
A German customer sent a mixed list of automation products and asked repeated questions about revisions, condition, photos, and delivery. Our team organized the requirements, checked every item, and replied point by point. The customer said our detailed communication made the purchasing decision easier and continued sending us new inquiries.
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