Diploma PLC 15 Manual 2017

The Diploma PLC 15 is a programmable logic controller designed for industrial automation applications, featuring 15 digital I/O points, analog inputs, communication ports (RS-232, RS-485), ladder logic programming, real-time clock, data logging capabilities, and robust industrial-grade construction. Below are key sections for safety, features, installation, programming, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Programming Basics 8. Communication Features 9. Maintenance & Care 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: CPU module with 15 I/O points, programming port, communication interfaces, power supply unit, and mounting accessories.

Feature	Description
Digital Inputs	8 points for sensor and switch connections
Digital Outputs	7 points for relay and actuator control
Analog Inputs	2 channels for voltage/current signals
RS-232 Port	For programming and device communication
RS-485 Port	For network communication and MODBUS protocol
Power Supply	24V DC industrial power input
Status Indicators	RUN, ERROR, I/O status LEDs
Memory	16KB program memory with battery backup
Real-time Clock	For time-based operations and data logging
Programming Software	Diploma Ladder Logic Editor (included)

Installation

Unpack and inspect contents. Mount on DIN rail or panel.

Mounting: Secure to DIN rail or panel using provided clips.
Power connection: Connect 24V DC power to terminals (+V, 0V, GND).
I/O wiring: Connect field devices to appropriate input/output terminals.
Communication: Connect programming cable to RS-232 port.

WARNING! Ensure proper grounding and follow electrical safety standards. Disconnect power before wiring.

First-Time Setup

Power on PLC; configure basic parameters.

Connect programming cable: Use RS-232 to PC connection.
Install software: Load Diploma Ladder Logic Editor on PC.
Configure communication: Set COM port and baud rate (default 9600).
Download first program: Create simple test program and download to PLC.
Verify operation: Check I/O status and program execution.

CAUTION! Ensure proper voltage levels and polarity for power connection.

Specifications

I/O Points: 15 total (8 DI, 7 DO)
Analog Inputs: 2 channels, 0-10V/4-20mA
Program Memory: 16KB with battery backup
Communication: RS-232, RS-485 (MODBUS RTU)
Power Supply: 24V DC ±10%
Operating Temp: 0°C to 55°C
Storage Temp: -20°C to 70°C
Humidity: 5% to 95% non-condensing
Dimensions: 90mm x 70mm x 60mm
Weight: 250g

Controls and Settings

Front panel: RUN/STOP switch, STATUS LEDs, RESET button.

Software Interface: Ladder logic editor, online monitoring, force I/O, data registers, timer/counter configuration.

System Settings: Communication parameters, real-time clock, password protection, data logging intervals. I/O Configuration: Input filter times, output pulse widths, analog scaling. Programming: Ladder logic elements, function blocks, math operations, data handling.

Connecting Devices

Input devices: Sensors, switches, pushbuttons. Output devices: Relays, contactors, indicators, solenoids.

Disconnect power before wiring connections.
Use proper wire gauge (0.5mm² to 2.5mm² recommended).
Follow terminal designations for inputs (I0-I7) and outputs (Q0-Q6).
Connect analog signals to AI0 and AI1 terminals.

Tip: Use shielded cables for analog signals and long communication lines.

Programming Basics

Supports ladder logic programming with standard IEC 61131-3 elements.

Create new project: Open Diploma Ladder Logic Editor.
Add ladder elements: Contacts, coils, timers, counters, comparators.
Configure parameters: Set timer values, counter presets, data registers.
Compile program: Check for syntax errors.
Download to PLC: Transfer program via RS-232 connection.
Test and debug: Use online monitoring to verify logic.
Save project: Store program file for backup.

WARNING! Always test programs in safe conditions before deployment in production.

Communication Features

RS-485 Network: MODBUS RTU protocol for master/slave communication. RS-232: Programming and point-to-point communication. Data Logging: Store process values with time stamps.

Maintenance & Care

Regular inspection: Check connections, clean dust, verify proper operation. Battery replacement: Replace backup battery every 2 years or when low battery indicator appears.

CAUTION! Disconnect power before maintenance. Use only approved replacement parts.

Regulatory Information

CE Certified: Complies with European EMC Directive. UL Listed: Meets UL 508 industrial control standards. RoHS Compliant: Free of hazardous substances. Copyright © 2017 Diploma Automation Systems; all rights reserved. For technical support, visit www.diploma-automation.com or contact +44 (0)1234 567890.

Troubleshooting

Symptom	Possible Cause	Corrective Action
PLC not powering on	Power supply issue	Check 24V DC power; verify polarity; check fuse.
No communication	Cable/port settings	Verify cable connection; check COM port settings; restart software.
Inputs not responding	Wiring/sensor issues	Check input wiring; verify sensor operation; check input LED status.
Outputs not activating	Load/wiring problems	Verify output wiring; check load compatibility; inspect output LED status.
Program not running	Mode/configuration	Ensure RUN mode is selected; check for program errors; verify scan time.

Reset: Use RESET button or power cycle for system reset.

Service: +44 (0)1234 567890; www.diploma-automation.com