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Programmable Controllers > Do-more Series (BRX,... > BRX Series PLCs (Stackable Micro Brick)

In Depth

BRX PLCs are Do-more^® Driven: Motion on multiple levels

Integrated Motion on Multiple Levels

Motion with BRX PLCs can be as easy or sophisticated as you need. Three levels of instruction complexity allow you to choose the degree of customization involved with your motion control application. Choose the zero complexity option with minimal user input, the intermediate level for more user-defined features, or the advanced level to create custom move profiles. And with the built-in high-speed I/O, the BRX platform takes practical motion to a whole new level.

Get in motion...it's easy with BRX

All BRX PLC models with 24VDC I/O have high-speed inputs and outputs built in with an additional 128 250kHz or 128 TTL (64 differential) 2MHz local high-speed points possible through expansion. This high-speed I/O can be used to track rapid encoder pulses, drive stepper motors, or can be configured for other counter/timer, axis/pulse, pulse-width-modulated or table-driven functions:

Timer/Counter: BRX PLCs can be configured to count input pulses, or measure the time between pulses, up to a 2MHz maximum pulse rate.
Axis/Pulse: BRX PLCs can have up to three axis of control with an additional virtual axis for internal control and following applications.
Pulse Width Modulation (PWM): The high-speed outputs can also be used to generate a carrier frequency with varying pulse widths.
Table-driven: Tables of preset values can be used to turn the high-speed outputs ON and OFF based on the pulse count values of one high-speed input.

Ignore the noise...for accurate control

Single-ended signaling is the simplest, and in terms of wire cost, the least expensive method of transmitting high-speed electrical signals. With this type of transmission, one wire carries a voltage that represents the signal while the other wire is connected to a reference voltage, usually ground. This wiring method can pose a serious problem in industrial applications that are prone to electromagnetic interference from motors, compressors, power generation, etc. The noise induced on nearby wires from these devices can cause inaccurate counts, inconsistent positioning, or erratic motion profiles.

On the other hand, differential signaling ignores the noise that is induced on the line and focuses on the difference in the supplied signals. This type of transmission requires an additional wire, with one carrying the normal signal and the other carrying it's inverse. Any noise induced on the wires will affect both the normal and inverse signals the same, causing the difference between the signals, or differential, to remain the same as well. By focusing on the differential, the BRX HSIO4 module can effectively void any inaccuracies caused by noise.