If the board is in output mode, the board has enough power to override the pull-up/down resistor's high signal and drive the line to 0 volts. If the output circuit asserts a high signal, the pull-up resistor guaranties that the line goes to +5 V.

Of course, a pull-down resistor accomplishes the same task except that the line is pulled low when the board is reset. The board has enough power to drive the line high.

The PCI-DIO96 series boards are equipped with positions for pull-up/down resistors Single Inline Packages (SIPs). The positions, marked PORT#A, B and C, are located adjacent to the I/O connectors.

A 2.2K, 8-resistor SIP is made of eight 2.2K resistors all connected with one side to a single common point, the other side of each to a pin protruding from the SIP. The common line to which all resistors are connected also protrudes from the SIP. The common line is marked with a dot and is at one end of the SIP.

The SIP may be installed as pull-up or pull-down. At each location, PORT#A, B & C on the PCI-DIO96 series boards, there are 10 holes in a line. One end of the line is +5V, the other end is GND. They are marked HI and LO respectively. The eight holes in the middle are connected to the eight lines of a port 1 through 4, A, B, or C.

A resistor value of 2.2K is recommended. Use other values only if you have calculated the necessity of doing so.

UNCONNECTED INPUTS FLOAT

Keep in mind that unconnected inputs float (typically, but not reliably, high). If you are using the PCI-DIO96 board for input, and have unconnected inputs, ignore the data from those lines.

You do not have to tie input lines, and unconnected lines will not affect the performance of connected lines. Just make sure that you mask out any unconnected bits in software!

7.2 TTL TO SOLID STATE RELAYS

Many applications require digital outputs to switch AC and DC voltage motors on and off, or to monitor AC and DC voltages. These AC and high DC voltages cannot be controlled or read directly by the TTL digital lines of a PCI-DIO96.

Solid State Relays, such as those available from OMEGA Engineering Inc. allow control and monitoring of AC and high DC voltages and provide up to 4000VAC isolation. Solid State Relays (SSRs) are the recommended method of interfacing to AC and high DC signals.

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Omega Engineering PCI-DIO96 user manual TTL to Solid State Relays, Unconnected Inputs Float
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PCI-DIO96 specifications

The Omega Engineering PCI-DIO96 is a versatile and high-performance digital input/output board designed for a wide range of industrial automation and data acquisition applications. With its robust features and advanced technologies, the PCI-DIO96 stands out in the field of digital I/O expansion cards.

At the core of the PCI-DIO96 is its capability to handle 96 digital I/O channels, making it suitable for applications that require extensive control and monitoring. The board is equipped with 96 lines that can be individually configured as input or output, providing flexibility to manage various digital devices such as sensors, valves, and relays. This configuration is particularly beneficial in complex systems where a mix of digital signals is needed.

One of the most notable characteristics of the PCI-DIO96 is its high-speed operation. The board supports data transfer rates that can accommodate demanding applications, enabling rapid response times crucial in industrial environments. This high-speed capability ensures that it can keep up with the fast-paced demands of modern automation processes.

The PCI-DIO96 also includes additional features such as programmable timers and counters, allowing for precise control and measurement of time-sensitive processes. This performance enhancement is especially useful in applications requiring synchronization of multiple digital signals or sequential operations.

Another significant advantage of the PCI-DIO96 is its compatibility with various operating systems and widely-used programming environments. It can be seamlessly integrated with popular data acquisition and control software, providing users with a familiar setup process. This ease of integration diminishes the time required for installation and setup, allowing for quicker deployment in projects.

The hardware design of the PCI-DIO96 also emphasizes reliability and ease of use. The board is built with durable components to withstand the rigors of industrial settings, ensuring longevity and reliability in various conditions. Additionally, its straightforward installation process translates into minimal downtime during setup.

In conclusion, the Omega Engineering PCI-DIO96 is a powerful digital I/O board that combines extensive channel capacity, high-speed performance, and robust features. Its versatility makes it an ideal choice for diverse applications in industrial automation, offering reliability and ease of integration that professionals in the field seek for their projects. Whether for monitoring, control, or data acquisition, the PCI-DIO96 remains a trusted solution for engineers and technicians alike.
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