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Consequences of Duplicate Addresses on a ModBus Plus Network

As with any addressable network, having duplicate addresses is an issue. On Modbus Plus networks, one of three things can occur. Modicon technical support disagrees on this subject but in my 30+ years of working with these networks all over the world, I have proven...

Isolating fiber modems with a Bridge-Plus Device

Despite some drawbacks, installing a bridge-plus device can protect networks by isolating the fiber portion of the segment into its own separate network. Tokens are not passed across a bridge-plus device. So if a “double failure” occurs, it only affects the nodes on...

Having an Existing Certification report Saves the Day!

Recently a large water management facility called upon Delta Automation, Inc. to revive their Modbus Plus network which was knocked out of commission due to a thunderstorm. This network had been certified by Delta Automation, Inc. several years ago during an...

Grounding Schemes on different Types of Modbus Plus Connectors

There has been a great deal of conversation and resulting confusion with regard to the grounding schemes involved with the different types of Modbus Plus connectors. As we all know from “Electricity 101”, there should only be one single point ground on any given...

Summer Storms and Modbus Plus Systems

During the Summer months, especially in the southern states, late evening thunderstorms are an almost everyday occurrence. The violent lightning that typically accompanies these storms is a very real and sometimes destructive threat to communication systems. Very...

Schneiders’ Modbus Plus Super Tap

Recently Delta Automation Inc. Engineers were tasked to evaluate the newest addition to the existing lineage of Modbus Plus Taps, The Super Tap, part number  990 NAD 230 20/21. Left to Right: Super Tap, MBKT, Phoenix Tap, TEE Tap, and Ruggedized Tap Delta found...

Common Installation Mistakes on ModBus Plus Networks

While Modbus Plus is a robust network of peer to peer communications used on process control and data acquisition applications, several basic mistakes are commonly uncovered during the certification process performed by Delta Automation, Inc.’s Field Service...

Utilizing a MSTR block to retrieve the Peer Cop Health Status

When using an MSTR block to retrieve the Peer Cop Health Status, you must translate the bit information received to correspond with the node’s actual Modbus plus address. The health table is 12 words in length (0-11). Words 0-3 (bits 1-64) contain the health status...

Modbus Plus Traffic Issues in Bridge Plus Devices

It is important to keep in mind when deciding the routing paths for your data transmissions which utilize more than one Modicon Bridge Plus device, the amount of traffic which may attempt to flow through it. While a “backbone” of bridges on the main trunk of a Modbus...

Modbus Plus Nightmare Resolved on Death Row

Example of the sub panels that were used A maximum security prison facility in North Carolina, had recently increased the size of its Death row section and installed a new Momentum based door locking system. The contract was given to a system integrator familiar with...

Phoenix Contact Modbus Plus Tap Module Assembly

Delta Automation Inc. has recently been requested to test the Phoenix Contact Modbus Plus Tap assembly. Phoenix Tap This unique design allows for both the drop cable and the trunk cable to be terminated with screw down type terminals. It also allows for the ability to...

Modbus Plus multi-use test cable

Have you ever had the need to connect a device to monitor a Modbus Plus network only to find that there is no spare or maintenance connector available? It is always a good practice to have an additional connection point available to utilize for any trouble shooting...

Utilization of Momentum “Cluster Connectors” with Modbus Plus

The Momentum product is a wonderful product for low cost, easy to install remote located “drops”.  This product can be utilized as a stand alone device or within a network of many units. A common installation practice is to install several of the units “clustered...

ModBus Plus Installation Kit

Delta Automation Inc. is currently in production of a complete installation kit for ModBus Plus. This kit will include: cable cutters, a stripping tool, a compression tool, a punch-down tool , screwdriver and carrying case. This kit will also include several of the...

Modbus Plus Industrial (Rugged) Tap Utilization

The ability to have connectivity without disruption to an existing network is a wonderful concept. However, this does come at a price. Both in procurement dollars ($168.00 each) and in total network performance. For this discussion, we will disregard the pricing...

Delta Automation Inc.
5120 Glen Alden Drive
Richmond, Virginia, 23231

Sales@Deltaautomation.com

Delta Automation, Inc., located in Richmond Virginia, is an Industry Leader in Industrial Electronics Remanufacturing (depot type repair), On-Site Field Service, New Equipment Sales, and Mature Equipment Sales. Our focus is on Programmable Controllers (PLCs), Drives (VFDs), Control Screens (HMIs) and Peripheral Hardware Support (to include, Software & Firmware). With over 50 years of Repair and Support, we proudly offer our services.

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