Pasaban MTC‑3052 High‑Speed Digital I/O Card for PLC Systems

The Pasaban MTC‑3052 is a high‑performance fast I/O card designed to expand the digital input/output capabilities of industrial programmable logic controllers (PLCs) and embedded control systems. It features 16 optically isolated digital inputs and 16 high‑current transistor outputs, suitable for high‑speed counting, positioning, and real‑time machine control. The card adopts a standard Eurocard form factor (100×160 mm) and communicates via a parallel backplane interface or user‑defined SPI/I²C.

Digital Input Specifications

The 16 inputs are galvanically isolated with optocouplers (isolation voltage 2.5 kVrms). Acceptable voltage range: 12‑30 V DC (nominal 24 V). Input current: 4 mA at 24 V. Response time: less than 50 µs at the input filter’s minimum setting (configurable via hardware jumpers to 0.05 ms, 0.5 ms, or 2 ms). Each input has an LED indicator. Inputs are arranged as two groups of 8 with a common return per group (sinking type). The card supports 32‑bit incremental encoder interfaces using two inputs as A/B phases (up to 200 kHz).

Transistor Output Specifications

The outputs use power MOSFETs (N‑channel, open drain). Each output is rated for 0.5 A continuous at 24 V DC (resistive load), with a total current limit of 4 A per 8‑output group. They include built‑in flyback diodes for inductive loads (e.g., relays, solenoids). Switching speed: turn‑on<20 µs, turn‑off <30 µs. Output protection: short‑circuit and overtemperature shutdown per channel, with automatic retry. Output status LEDs are provided. Outputs can be configured as PWM outputs (up to 20 kHz) via software.

Interface and Control

The MTC‑3052 connects to the host PLC through a 64‑pin DIN 41612 connector (type C). Address decoding occupies 4 consecutive I/O addresses. Data transfer uses 8‑bit or 16‑bit parallel read/write cycles with a maximum access time of 150 ns. An onboard CPLD manages interrupts: two interrupt lines can be routed to the host for high‑speed events (e.g., counter overflow or input edge). The card also provides a 10‑pin header for external power (24 V) and an optional external supply for outputs to offload the backplane.

Configuration and Diagnostics

Configuration is done via the host PLC’s I/O configuration tool; the card supports plug‑and‑play for most backplanes. Jumpers select base address, interrupt level, and input filter time. Diagnostic features include power‑on self‑test (POST) that checks RAM and I/O lines, plus an onboard temperature sensor. An 8‑bit register reports overcurrent or overheating for each output group. The card’s firmware can be updated via JTAG (Boundary Scan compliant).

Environmental and Certifications

Operating temperature: 0‑60 °C; storage: -40‑85 °C. Humidity: 10‑95% non‑condensing. The PCB is coated with a conformal coating (class 3C2 for moderate pollution). The card meets EN 61000‑6‑2 (industrial immunity) and EN 61000‑6‑4 (emission). RoHS compliant.

Application Examples

The MTC‑3052 is used in high‑speed sorting machines, pick‑and‑place controllers, packaging inspection systems, and legacy PLC upgrades. Its fast response time (50 µs) and high output current (0.5 A) allow direct driving of small valves, indicator lamps, and solid‑state relays without external amplifiers. When used with encoder inputs, it can track linear or rotary positions for synchronised motion applications.