RECO-PC-104 S4 LK SIO 4-B

The RECO-PC-104 S4 LK SIO 4-B interface board is manufactured by Bosch Rexroth Indramat for the RECO Drive Modules series. It functions as a serial communication add-on, enabling drive controllers to interface with external devices over multiple electrical standards. Mounted directly within the modular drive stack, the board relays machine status, diagnostic messages, and parameter data between the automation layer and field components, helping plant operators coordinate motion tasks and service routines. Its role in industrial automation is to give the control system flexible point-to-point links without dedicating a higher-level network port, which is useful when integrating barcode readers, operator terminals, or legacy drives.

The board communicates with the host CPU through the PC/104 bus, so data and power are exchanged over the same 104-pin stack connector. Electronics on the card are stabilized by a supply rail that may drop to 4.5 VDC and rise to 5.5 VDC without losing logic integrity, while total consumption is limited to 250 mA at peak traffic. Each receiver channel presents an input capacitance of 15 pF; keeping this value low minimizes rise-time distortion on high-speed serial lines. On the driver side, the circuitry can source 12 mA, providing adequate margin to meet RS-422 loading requirements across typical cabinet wiring lengths.

Signal integrity toward the controller is preserved by input leakage that does not exceed 5 µA, so optically isolated sensors do not experience unintended bias. When the card transmits, the bus sees an effective load of 150 pF, which limits the cable length before waveform rounding becomes critical. The module occupies 2 slots in the RECO stack. It exposes a total of 4 serial interfaces: two RS-232 ports on connectors X35 and X36, plus two RS-422/485 ports on X40 and X41. These interfaces allow simultaneous connections to drives, human-machine interfaces, and diagnostic computers without external hubs.