OC950-603-01

OC950-603-01 is a Pacific Scientific component in the OC950 Option Cards series. It provides 21 bidirectional I/O channels, allowing each channel to support input or output functions. The input pull-up is 10 kΩ to +12 VDC, which holds an un driven input at a known voltage level. Its low-to-high threshold is 3.5 V maximum, while the high-to-low threshold is 1.0 V minimum; these thresholds determine how input voltage levels are interpreted. A 100 µs filter time constant helps reject short input transients.

The output sink capability is 100 mA, indicating the current each applicable output can draw to ground. Output impedance is 9.5 Ω maximum at 125ºC. The user supply operates at 5 V ±5% and draws up to 200 mA, establishing the required external power characteristics.

PacLAN communication runs at 2.5 MBaud and uses 93 Ω termination to reduce signal reflections on the network. The maximum bus length is 305 m, supporting communication across extended installations, and each segment accommodates up to eight stations. The serial interface supports RS-232 and RS-485 connections for point-to-point or multidrop communication.

Program memory consists of 32K × 8 NVRAM, providing nonvolatile storage for program data. The NVRAM has a data-retention period of 10 years, allowing stored information to remain available without continuous power.