PS12DC Datasheet
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Summary
The PS12DC is a power switching board designed for medium to low current DC power switching applications. Controlled through 12 digital outputs, the board can switch power sources ranging from 5 to 28V DC. Attach the PS12DC to the DB15 connector presented on all compatible devices, and toggle the states of the EIO and CIO digital output lines to turn the switches on/off. This device requires at least one compatible power supply, and a multi-channel digital output source, such as a LabJack, or Arduino.
Features
- 12 digitally controlled switches with LED indicators
- Optical isolation
- Handles 5 - 28 Volt supply
- Up to 750mA/chan
- Resettable fuse protection
- Flyback protection
Compatible Devices
Typical Applications
- Solenoid Valves/Actuators
- Relays
- Simple DC Motors
- Horns/Bells/Alarms
- Blowers/Fans
- Low Voltage DC Lighting
- LED Drivers
How-To Use
You will need a LabJack, a PS12DC, and something to control. The diagram below demonstrates how to make connections for controlling a DC Motor, and a Fan.
- Option A - Items are powered by 5V power supply (VS) located on the LabJack, this is the most basic connection.
- Option B - Items are powered by 12V external power supply.
- More Options - See Appendix A - Wiring Diagrams
Once the wires are attached, turn the DC Motor on and off by toggling the state of the appropriate digital control line. When the control IO is output-low, S0 will sit at 0V. When the control IO is output-high, S0 will be at the voltage connected to VS1. Look at the IO Reference table below to identify which control line to toggle. The DC motor is connected to S0, so that means a state change in EIO0 will turn it on and off.
If the PS12DC is attached to the LabJack differently than in the picture above, there will be a different corresponding digital IO line. The full pinout details can be seen in Appendix C - Pinout Info .
Download LJControlPanel to get started, or create a program in one of our supported languages to communicate with the LabJack. It will also be necessary to install the UD driver, so the LabJack is recognized over USB.
Other Compatible Devices
Connect a PS12DC to any device with 3.3V to 5V digital outputs through the use of the P3 pin header. This includes Arduino, homemade boards, PCI DAQ boards, etc. Please note that when using other digital output boards, support is limited to the PS12DC. The image below shows an example of how to connect a PS12DC to an Arduino.
The Arduino has 14 digital IO pins, the first 12 are connected to the PS12DC, and the two GND wires on the PS12DC are tied to GND on the Arduino.
Multiple PS12DC boards can be connected to a single compatible LabJack, as shown in the image below. See Appendix B - Connection Options for more information.
Dimensions
Troubleshooting
If there are problems with the PS12DC, insure the following:
- There is a working power supply (5 to 28V) connected to one of the power supply blocks, e.g. VS1/GND1. Connect wires to VS as shown below if no power supply is available.
- The switch number under inspection is being powered. For instance, if checking S8, verify that VS5/GND5 are connected to a working power supply.
- Verify that the LEDs turn on and off when the digital output states on the LabJack are toggled high and low. This can be accomplished by opening LJControlPanel, and checking/un-checking the boxes next to the digital output of interest. Or download the test program: LJTestPS12DC.zip
Comments
#1
Can P1 and P3 connectors be utilized at the same time, allowing multiple inputs. For example, a PS12DC connected to U6Pro thru P1 (standard connection), and then the U6Pro +5V terminal connected through an external toggle switch to the PS12DC P3 DI0. Would this allow both the toggle switch and U6Pro EIO0 to turn a device connected to PS12DC S0 on and off, in a logical 'OR' type fashion.
#2
The PS12DC would work as you suggest, the toggle switch could also activate the item on S0. If you use 5V VS, (or anything >3.3V), you should also change the U3-LV digital IO line to input, rather than output-high, or output-low, to avoid over-heating on the protection resistors.
If the toggle switch is at 5V, and the U3-LV is left as output-high (3.3V), 0.0289W of power are dissipated in the protection resistors (100Ohm) on the EIO lines. The FIO lines have slightly larger protection resistors (470Ohms), so they would not get that warm.
If the DIO lines are left as output-low, then 0.25W of power would be dissipated in each resistor. Each resistor is rated to 0.25W, so it is at the upper limit of operation, and each IO line would be pulling 50mA of current from VS. If all 8 EIO lines were set in this configuration, it would take 400mA, so again, probably best to set the DIO lines to input.