The **LC4H-R6-AC24V** is an electronic digital counter/timer manufactured by Panasonic (formerly Matsushita/NAiS). This specific model belongs to the LC4H series, known for its bright backlit LCD and DIN 48 size form factor. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Series** | LC4H (Digital Counter) | | **Output Type** | Relay Output (Form C / SPDT) | | **Number of Digits** | 6 Digits | | **Supply Voltage** | 24V AC (50/60 Hz) | | **Mounting Type** | Flush / Panel Mount (11-pin terminal) | | **Display** | 7-segment Backlit LCD (Two-color) | | **Max counting speed** | 30Hz or 5kHz (Switchable) | --- ### 2. Breakdown of the Model Code To understand the electronic capabilities, we can deconstruct the part number: * **LC4H**: The series designation (Digital Counter). * **R**: Indicates **Relay Output**. This means the internal electronics trigger a physical electromagnetic switch capable of handling higher currents (typically 5A at 250V AC). * **6**: Refers to the **6-digit** display capacity (0 to 999,999). * **AC24V**: The operating voltage required to power the internal logic and the relay coil. --- ### 3. Electronic Features & Internal Logic #### A. Input Signal System The device uses a **voltage-free input** (NPN open collector or contact input). * **Count Input:** Increments or decrements the value based on the selected mode. * **Reset Input:** Returns the display to zero or a preset value. * **Gate Input:** Temporarily pauses the counting process without resetting. #### B. Memory Backup It features internal **EEPROM** memory. In the event of a power failure, the current count and set parameters are retained without the need for an external battery. #### C. Two-Color Display The electronics control a dual-color backlight (typically Red/Green). You can configure the display to change color when the count reaches the "Set Value," providing a visual status indicator at a distance. #### D. Dip Switch Configuration On the side of the unit, there are physical DIP switches. These allow the user to electronically configure: * Counting mode (Up, Down, Direction, Individual, Quadrature). * Minimum input signal width (1ms or 20ms). * Maximum counting speed. --- ### 4. Terminal Pin Layout (11-pin) For electronic integration, the following pins are critical: 1. **Power (2 & 10):** Connect to 24V AC source. 2. **Relay Contacts (1, 3, 4):** COM, NO, and NC for controlling external loads. 3. **Signal Inputs (5, 6, 7):** Reset, Gate, and Count inputs. 4. **Sensor Power (8 & 9):** Provides a DC output (usually 12V) to power external sensors like proximity switches or photoeyes. ---