Product Description:

The OC950-502-01 option card is manufactured by Pacific Scientific for the OC950 Option Cards series. Designed for installation in compatible servo drive or motion controller racks, the board supplies additional digital inputs, outputs, and serial communication resources that let an automation cell exchange process data with supervisory PLCs and sensors. In a production line, it acts as the electrical interface between low-level devices and the control CPU, translating field signals into logic-level events and forwarding command packets through its serial ports.

The board’s nonvolatile program area is 128K x 8, so user macros and configuration tables can be stored locally without consuming controller memory. Signal flexibility is provided by 21 discrete I/O channels, and each channel can be configured as a sourcing or sinking point. For host connectivity, the card supports the multi-drop RS-232/RS-485 serial interface and transfers framed messages using a 10-bit word length. A 100 µs RC filter constant is applied to every input to suppress contact bounce, and stored program data and parameter blocks remain intact for 10 years.

Output stages use open-drain DMOS transistors that can sink up to 100 mA per channel while sourcing power from the drive backplane. The user logic rail delivers 5 V ±5%, and external drive levels must remain below the 40 V absolute maximum to avoid device stress. The internal EEPROM supports unlimited write cycles, so set-point adjustments and diagnostic counters can be updated continuously without wear concerns. Threshold switching occurs below 1.0 V on a falling edge and above 3.5 V on a rising edge, with a built-in 10 kΩ pull-up that biases open inputs. The 9.5 Ω drain-to-source impedance at 125 °C helps maintain predictable timing even in heated enclosures.