Product Description:

The OC940-001-01 option card is manufactured by Pacific Scientific for the OC940 Option Cards series. It is an expansion board that installs beside a host servo drive or motion controller and supplies additional field-level connections for industrial automation tasks. This arrangement allows discrete machine signals to be handled close to the drive, which can reduce separate interface hardware in compact cabinets. By adding this card, the control system can exchange status and command signals directly with switches, sensors, and small actuators on the machine.

The card communicates over the SERCOS real-time fiber interface and ships with a default speed of 2 Mbaud, so cycle synchronization with neighboring drives is available after power-up. Eight digital inputs and eight digital outputs are included, and every channel is protected by optically isolated circuitry that breaks ground paths between the machine and control logic. Input processing uses 1.3 V of hysteresis around a 50% supply trip point to help filter switch bounce, while an internal 4.42 kΩ pull-up resistor and a source current of 3.75 mA at 24 V DC establish a defined high state when contacts are open. The SERCOS transmitter is set to low power to suit short cabinet runs. On the output side, each open transistor can continuously sink up to 250 mA, allowing direct driving of most indicator lamps and relay coils.

A front clearance of 3.25 in is required for service access, and the outputs use an open-drain scheme so loads are tied to machine supply voltage rather than the card itself. Drain-to-ground voltage must not exceed 50 V, a limit that accommodates typical 24 V and 48 V control circuits. This layout keeps user I/O concentrated at the card face, which helps simplify harness routing inside the enclosure. All user signals are presented on a standard DB25 connector, simplifying harness fabrication without special tooling.