The PENKO SGM700 Digitizer is a versatile weighing indicator designed for integration into various industrial and factory automation systems. It serves as a partner for fully engineered factory solutions, offering a range of models (SGM700, SGM710, SGM720, SGM740, SGM750, SGM760) to cater to different communication and application needs.
Function Description
The SGM700 Digitizer's primary function is to accurately measure and display weight values from connected load cells. It can operate in various weighing modes, including standard indication, fast indication, silo, platform, belt weighing (slow and fast), filling (slow and fast), and checkweighing (slow and fast). The device supports multiple range and multi-interval modes, allowing for flexible display resolution depending on the gross or net weight on the scale.
It features four configurable outputs that can switch on/off based on different weight levels, making it suitable for setpoint control applications. The analog output (optional) can be configured to represent weight values as current signals (0-20mA, 4-20mA, 0-24mA, 4-24mA) or as a raw register value, providing an interface for external control systems.
Communication capabilities are a key feature of the SGM700 series. Depending on the model, it supports:
- Local bus (RS485): For communication with multiple devices.
- Ethernet (SGM720): Supporting Ethernet IP, Omron Fins, and Modbus TCP protocols, allowing for network integration and remote monitoring.
- Profibus DP (SGM740): For integration into Profibus networks, enabling data exchange with PLCs.
- Serial (RS232/RS422 for SGM750): Supporting various protocols like Printerm ASCII, NPV Slave, Modbus RTU, and Modbus ASCII for serial communication with other devices or printers.
- Profinet (SGM760): For integration into Profinet networks.
The device includes an Alibi Memory function, which saves information about dosed weight (for MFL models), checked weight (for CHK models), and actual weigher values (for Indicator models). This feature is crucial for traceability and compliance in certified weighing applications. An Event Log automatically records system events such as software updates and calibrations, providing a historical record of device changes.
Configuration of the SGM700 can be done either directly through the front panel keys and display or via the PI Mach II software, which offers a comprehensive interface for setting up all parameters, calibrating the device, and managing communication settings.
Important Technical Specifications
- Mounting: Designed for 35mm DIN rail mounting.
- Power Supply: Class 2 or Limited Power Source, rated 18 - 32 Vdc, 0.2A@24Vdc. When powered by USB (not 24Vdc), the load cell interface and analog output are non-functional.
- Heat Dissipation: Requires 30mm of space above and below for adequate heat dissipation.
- Load Cell Connection: 6-wire load cell connection, Vexc=5Vdc.
- Inputs: Input 1=5kHz 18-28Vdc (for SGM700, SGM720, SGM740, SGM750, SGM760).
- Outputs: 25V/0.5A AC/DC (for SGM700, SGM720, SGM740, SGM750, SGM760).
- Analog Output (optional): 0/4-20mA or 0/4-24mA.
- Display: LED display for weight values, status indicators (Weigher stable, Zero active, Tare active, Output active 1-4, Profinet BUS state).
- Sample Rate: Configurable from 10 to 1600 samples/sec.
- Digital Filter: 2nd order filter with configurable cutoff frequencies (oFF, 1.0Hz, 1.4Hz, 2.5Hz, 5.0Hz, 10.0Hz, 20.0Hz, 40Hz) and moving average cutoff frequencies (0-320 Hz).
- Amplifier Sensitivity: Selectable between 1.0mV/V, 1.5mV/V, 2.0mV/V, 2.5mV/V, and 3.0mV/V.
- Input Offset: Configurable between -50000 and 50000.
- Operation Mode: Industrial or Certified mode. In certified mode, weighing parameters are blocked to comply with calibration laws.
- Zero Band (Certified Mode): Fixed at 4% (+2 and -2%). Zero suppressing (FIL 3) is disabled in certified mode.
Usage Features
- Intuitive Front Panel Operation: The device can be fully configured using three front keys for short and long presses, allowing for navigation through menus, value adjustments, and confirmation of settings.
- Display Indication at Startup: Provides a sequence of information including display test, model name, software version, software update counter, Traceable Access Code (TAC), Calibration Code (CAL), and delay time for warming up.
- Weigher Settings: Allows setting maximum net weight value, display step size (1, 2, 5, 10, 20, 50, 100, 200, 500), and decimal point position.
- Multiple Range/Multi-Interval Modes: Configurable to adjust display resolution based on weight, with parameters for range size and maximum step size.
- Calibration: Supports both direct calibration with reference weights (zero point and gain point) and theoretical calibration using load cell specifications (maximum load, sensitivity, input offset). Geographic calibration settings (origin/location latitude and elevation) are also available for precise adjustments.
- Setpoint Control: Four outputs can be configured to activate at specific weight levels, with adjustable hysteresis for precise control.
- Digital Filtering: Advanced digital filters (overall filter, filter band, filter factor) can be applied to stabilize the weighing signal, with options for dynamic or static applications.
- Date and Time Configuration: Internal clock for accurate timestamping of events and alibi memory entries.
- Software Configuration (PI Mach II): A comprehensive software suite for easy installation, configuration, calibration, and management of the SGM700 via USB or Ethernet. It includes features like quick setup, detailed parameter settings, and backup/restore functionality.
Maintenance Features
- Firmware Update: The device supports firmware updates via USB using the PI Mach II Firmware Update Manager, ensuring access to the latest features and improvements.
- Event Log: Automatically records significant system events, including software updates and calibration changes, aiding in troubleshooting and compliance. The log can be viewed and cleared using PI Mach II.
- Alibi Memory: Stores critical weighing data, which can be viewed and printed (SGM750 Serial only) to maintain a verifiable record of operations. The memory can be cleared when necessary.
- Recall Function: Allows resetting all parameters to factory settings or erasing the file system, useful for restoring the device to a known state or resolving software issues.
- Backup and Restore: PI Mach II software enables backing up and restoring device configurations, including non-certified parameters and full device settings, with password protection for security.
- Error Codes: A comprehensive list of error codes is provided in the manual, along with descriptions and solutions, facilitating quick diagnosis and resolution of operational issues.
- Shielding and Grounding: Emphasizes the importance of earthing shields of all connected interfaces to a reference point (e.g., DIN rail) to ensure proper performance and safety.
- Qualified Personnel: Stresses that installation, operation, and maintenance should be performed by qualified personnel to ensure correct performance and safety.
- Replacement Parts: Only Penko-specified replacement parts should be used to maintain product performance and safety.
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