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BRX Do-More Do-More PLC PLC Learning

BRX (Do-More) PLC PID Ramp Soak Profile

The purpose of a ramp soak profile is to make gradual, controlled changes in temperature (Ramp), followed by a temperature hold (Soak) period.
We will be using our Do-More Proportional-Integral-Derivative PID Instruction with PWM output that we looked at last time to apply the ramp/soak profile. This will be done on the BRX Do-More PLC.
Using the immersion heater in a cup of water to keep the temperature at a constant value, we will be adjusting the profile of the temperature as we increase the setpoint (Ramp) and hold that set point for a predetermined time. (Soak) We will then decrease that temperature back to the original setting. (Ramp)
BRX (Do-More) PLC PID Ramp Soak Profile
We will be modifying our existing program from our PID with PWM Output post. Let’s get started.

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BRX Do-More Do-More Do-More Designer PLC PLC Learning

BRX Do-More PLC Analog Dusk to Dawn Program

A dusk to dawn sensor usually is discrete on/off of the lighting control. If we want to vary the lights to mimic more of the sunset and rise, we would use an analog output to control the lights. I was recently asked about such a program. Every day they wanted the lights to go off at 10 pm and come back on at 6 am. At 9:30 pm the lights would be on at 70% or 7volts of a 0-10V signal. In the next half hour, the program will bring the lights from 70% down to 0%. In the morning the lights will come back on within the half-hour from 0% to 70%. Poultry Farms are one place that would utilize this program.
BRX Do-More PLC Analog Dusk to Dawn Program
We will be developing a program that will do this with our BRX PLC (Do-More). Let’s get started!

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BRX Do-More Do-More Do-More Designer PLC PLC Learning

BRX Do-More PLC Controller Program Control

We will now look at program control in the BRX Do-More controller. The program control instructions will allow us to specify what parts of the logic get solved and when this happens. This will control how the PLC will scan and solve your logic in your program using a synchronous PLC Scan. Understanding the PLC program scan will explain the synchronous and asynchronous program scanning. Ladder logic programs get solved left to right, top to bottom. The result of the rung before is available for the next rung.
Using programs, tasks, and subroutines in our BRX Do-More Series PLC we can divide up our program into smaller segments. This will help when we troubleshoot the system in the field as the system integrator. Let’s look at some samples of each of the above-mentioned methods.

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BRX Do-More Click Communication Do-More Do-More Designer Modbus RTU PLC PLC Learning

Modbus RTU BRX Do-More Master to Click Slave PLC

Recently I was asked to demonstrate communication between a BRX PLC and Click PLC using Modbus RTU. Both PLCs are available from automation direct com. Modbus serial communication (Modbus RTU) is a standard protocol used in many automation devices. It works on a Master / Slave configuration. You can have only one master per network on Modbus RTU (Remote Terminal Unit). A maximum of 32 devices (Nodes) on the network can communicate to the master. A review of the Modbus RTU protocol (RTU frames) can be seen at the following URL.
http://www.rtautomation.com/technologies/modbus-rtu/
Using the BRX PLC as a Master, we will be communicating to the Click PLC (Slave). Our example will read 10 registers from the Click PLC and write 10 registers from the BRX PLC. Let’s get started!

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BRX Do-More Do-More Do-More Designer PLC PLC Basics PLC Learning

BRX Do-More PLC Installing the Software

The BRX PLC uses the Do-More Designer software which can be downloaded free of charge and includes a simulator. The latest Do-More Designer software version is 2.0.3. This is the same software that we used in the Learn PLC Programming Fee Video Series.
The Do-More Designer software can be used to program the whole series of programmable logic controllers.
BRX Do-More PLC Installing the Software - Do-More Designer
Do-More H2 (Micro Modular PLC)
Do-More T1H (Stackable PLC)
BRX Series PLC (Stackable Micro Brick)
We will be installing and reviewing the Do-More Designer software version 2.0.3. Version 2 is mainly to accommodate the new BRX Series PLC.

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BRX Do-More Do-More Do-More Designer PLC PLC Basics PLC Learning

BRX Do-More PLC System Hardware / Unboxing

The BRX Do-More series of programmable logic controllers is a stackable micro brick. This is sometimes also referred to as a shoebox PLC because of the shape and way in which expansion modules are added. This new BRX Do-More series PLC is the latest in the Do-More series of controllers that have hit the market.
BRX Do-More PLC System Hardware Unboxing
Do-More H2 (Micro Modular PLC)
Do-More T1H (Stackable PLC)
BRX Do-More Series PLC (Stackable Micro Brick)

The BRX Do-More series offers built-in data logging, integrated motion control, customization communication ports, and expansion capabilities. These features like other Automation Direct products are offered at a very good price point. BRX Do-More series of controllers will use the same software as the other Do-More PLCs (Do-More Designer) and is a free download. We will be looking at this full-featured software that comes with a simulator later in this series.

We will be walking through allot of the features of this powerful controller. Let’s start by looking at the hardware.