MICRO PANEL GS-2 Troubleshooting and Debugging

MICRO PANEL GS-2 Troubleshooting and Debugging

Product positioning and system composition

MICRO PANEL GS-2 is a visualization unit designed for low to medium complexity automation equipment, with touch area functionality that meets the basic requirements of modern human-machine interfaces (HMI). It does not run independently, but must be used in conjunction with SMM system memory modules and communication cards. The communication card is responsible for connecting automation equipment, such as PLC or controller, and its specific protocol and wiring method need to refer to the technical specifications of the corresponding card. The project data is created and loaded into the touch panel using PDT (Panel Design Tool) software.

From the perspective of system architecture, GS-2 is responsible for display and operation, SMM provides operating system and project data storage, and the communication card realizes data exchange with PLC. All three are indispensable. If any of these steps are configured incorrectly, it will result in communication failure, inability to download the project, or system failure to start. Therefore, when troubleshooting GS-2 issues, it is necessary to simultaneously check the display unit SMM、 Communication card, download cable, and PLC side configuration.

Mechanical installation and protection requirements

The external dimensions of GS-2 are 312 × 222 × 82 mm, the front panel opening size is 296 × 196 mm, the installation hole is M5, and the hole spacing is 284 × 194 mm. During installation, a minimum distance of 5 cm must be maintained between the top, bottom, rear, and other components of the equipment to ensure heat dissipation. The cooling trough cannot be obstructed by cables or other objects. The operating temperature specified for the equipment is based on vertical installation, natural air convection, and an altitude not exceeding 2000 meters. To meet the IP65 protection level, a specialized installation kit must be used, which includes a counter frame installed at the rear to ensure the pressure of the sealing ring on the thin panel. Please note that the IP65 installation kit is not included in the standard supply range and needs to be ordered separately.

For the scenario of replacing the old HMI, the opening size and installation hole spacing are the primary verification items. The 296 × 196 mm opening of GS-2 is different from many old panels. If the original opening does not match, the panel may need to be reworked or an adapter plate may need to be added. At the same time, it is necessary to confirm whether the depth inside the control cabinet is sufficient, and whether the power and communication lines can enter from the back.

Electrical connections and operating components

The power supply terminal of GS-2 is a 3-pin plug-in terminal labeled with 24VDC, PE, 0V. The power supply range is+20.4 to+28.8 VDC effective value; If there is ripple, the absolute value range is+18.5 to+30.2 V. The typical current consumption is 0.9 A, and the maximum starting current is 0.6 A for 2 seconds. There is a communication card slot on the back of the device, which can accommodate communication cards such as MPB-TP. The ROG PORT is a 9-pin D-Sub female connector used for project data download and printer connection. There are also+12V and+5V system voltage monitoring LEDs on the panel, as well as a DOWNLOAD button.

The RS232 interface of the ROG PORT is isolated and ungrounded, with a maximum connection length of 20 meters. The pin definitions are: 2 TxD, 3 RxD, 4 DSR, 5 Gnd, 6 DTR, 9+5V, and the casing is shielded. Pin 9 can only be used for additional hardware power supply of the original GS-2 and cannot be used for other products. Both ends of the download cable are D-Sub miniature female heads, and pins 2 to 6 must be connected in a 1:1 ratio. If using a printer, the GS-2 needs to be equipped with SMM-2, and the printer interface is located at the PROG PORT. The baud rate can be selected from 1200, 2400, 4800, 9600, and the maximum connection length is 20 meters.

SMM system memory module

The SMM system memory module is installed at the rear of GS-2 and is an independent unit. It is fixed with two rolling screws and can be disassembled without tools. SMM includes an operating system EPROM and project data Flash. There are two versions of SMM: SMM-1 is the standard version with a project data memory of 128 kB; SMM-2 is the enhanced version with a project data memory of 512 kB, and supports multilingual operations, additional image and text memory, as well as data recording through a ROG PORT connected printer.

SMM is equipped with a WRITE ENABLE switch. During normal operation, the switch must be in the OFF position. Only switch to ON when downloading project data. Insertion and removal of SMM must be done when the device is powered off, otherwise it may damage SMM or GS-2. During installation, it is necessary to ensure that the SMM is firmly fixed and that the contacts of the SMM or GS-2 are not touched by hands or conductive objects to prevent damage from electrostatic discharge.

Cable preparation and EMC requirements

Communication card cables must use shielded cables with a copper braided shielding layer. The connector housing should be made of metal or metalized, with a tin plated surface, and galvanized or yellow passivated surfaces should not be used. The cable shielding layer should be directly connected to the panel side connector housing, and connected to the GS-2 housing through screws and plug metal shields. Avoid transferring communication cables through terminals, as terminals cannot guarantee shielded connections of equal quality. If separation is necessary between control cabinets, D-Sub connectors with metal casings or connection systems with similar EMC characteristics should be used. If GS-2 and PLC are installed in different control cabinets, and the shielding layer is directly or indirectly grounded at the PLC end, equipotential connection wires need to be set between the control cabinets to prevent excessive compensation current from occurring in the shielding layer and shielding terminals.

If the download cable is only connected during debugging, maintenance, and testing, it can be left unshielded; If it is also connected during normal operation, shielded cables must be used, and the shielding layer is connected to the GS-2 housing through a metal connector housing. The printer cable should also use shielded cables and be grounded according to the printer manufacturer's requirements.

Recommended steps for shielding connections: Peel off the cable; Shorten the exposed shielding braid by about 3 cm; flip the braid back into the cable sheath; Cover the folded shielding braid with heat shrink tubing or insulation tape, leaving 5 to 8 mm of exposed shielding at the sheath end; Install connectors; Fix the cable, along with the exposed shield and sheath, under the cable clamp of the connector housing.

System Mask: Status and Download

GS-2 has two important system masks: status mask (TROUBLE SHOOTING) and download mask (PROJECT UP -/DOWNLOAD).

The status mask is activated by the operating system during system failures, such as inability to establish communication with the PLC during startup or communication interruption during operation. It displays system configuration, memory status, and communication status. Touch the screen to return to normal operation mode and perform pre settings. The fields include: POS version, PDT version, communication driver, memory capacity, system memory status, communication card status, PLC link status, pre-set data status, PROG PORT application and status. If "BOARD TYPE" displays OK, it indicates that the communication card has been initialized; PLC LINK "displays NOK, indicating that communication with PLC has not been established; The 'PRESSET DATA' displays NOK, indicating that the preset was not successful. The memory area should all display OK or "-".

Download the mask by pressing the DOWNLOAD button. It provides the transmission function of project data between PC and GS-2, as well as system clock settings. The display content includes: POS version, PDT version, communication card firmware version, communication card identification, communication driver, hardware configuration, project data memory capacity, PLC driver. The clock settings include minutes, hours, days, months, and years, which can be adjusted by adding or subtracting touch zones. The project name, Transfer Active status, START, and EXIT buttons are all in this mask. When Transfer Active flashes, it indicates that data transfer can start from the PC. The data type, total number of blocks, and current number of transmitted blocks are displayed below.

Debugging steps and communication establishment

Before debugging, ensure that the WRITE ENABLE switch of SMM is turned off. Check if the communication card configuration is correct. Connect the GS-2 power terminal to a 24V power supply, but do not connect the PLC for now. After power on, the system will run SYSTEM CHECK&STARTUP and display the demonstration project. After a few seconds, due to the failure to establish PLC communication, a TROUBLE SHOOTING status mask will appear. At this time, check the memory status, which should be all OK or "-"; The communication status should be BOARD TYPE OK, PLC LINK NOK, PRESSET DATA NOK. Touch the screen to return the project mask.

Press the DOWNLOAD button to enter the download mask. Turn the WRITE ENABLE switch of SMM to ON. Use a download cable to connect the ROG PORT of GS-2 to COM1 or COM2 of the PC. Press START in the download mask, and Transfer Active will start flashing. At this point, the project can be transmitted through PDT software. After the download is complete, GS-2 automatically restarts, displaying the system test first, followed by the first project mask, and then enters TROUBLE SHOOTING again due to the PLC not being connected. At this point, the WRITE ENABLE switch must be turned back to OFF.

Next, connect the communication cable to the communication card and PLC communication port. GS-2 will automatically establish communication, and PLC LINK will change from NOK to OK. Touch the screen, GS-2 will perform the first preset, and then enter normal operation. If communication still cannot be established, check the communication card configuration, whether the communication driver is initialized, cable wiring, PLC side protocol, and baud rate.

Firmware update and Comboard Loader

The firmware of some communication cards is stored in Flash. Starting from POS 5.01 of the operating system, GS-2 supports loading communication card firmware through PROG PORT to achieve user-friendly updates of communication drivers. When updating, it is necessary to unplug the operating mode jumper (usually J7) on the communication card from RUN to PRG, and then reinstall GS-2. Connect the PC serial port to the ROG PORT of GS-2 using a download cable and power it on. The red ERROR light on the communication card should be on, the green ACTIV light should flash 4 times per second, and then both lights should go out. GS-2 displays COMBOARD LOAD VERSION 2.0. Run COMLoad.EXE and firmware binary files on a PC. The green ACTIV light flashes intermittently during transmission; After successful transmission, the green light goes out and the red light does not light up. Power off, turn the jumper back to RUN, and reinstall the communication card. You can view the current driver version in the download mask.

Common troubleshooting and replacement suggestions

Unable to start or black screen: Check if the 24V power supply is within range, if SMM is securely plugged in, if WRITE ENABLE is OFF, and if the communication card is installed properly. If the power supply is normal but there is no display, it may be a hardware failure of SMM or GS-2, and you can try replacing SMM or the whole machine.

Communication failure: The status mask displays PLC LINK NOK. First, confirm that the communication card type matches the PLC protocol and whether the communication driver has been initialized. Check the shielding and wiring of communication cables, confirm the baud rate, station number, and terminal resistance on the PLC side. If the communication card is damaged, it can be replaced with a card of the same model and the firmware can be reloaded.

Download failed: Confirm that the WRITE ENABLE is ON, download cable 2 to 6 pins 1:1, PDT version is compatible with the project, and SMM capacity is sufficient. If Transfer Active does not flash, check the PC serial port and cable. After the download is complete, be sure to turn off WRITE ENABLE.

Touch unresponsive or drifting: Clean the screen surface, check for strong electromagnetic interference, and confirm that communication cables and power cables are routed separately. If the touch area fails locally, it may be a hardware problem with the touch panel and needs to be replaced.

Printer not working: Confirm that SMM-2 is used, the printer is connected to the ROG PORT, the baud rate matches, and the cable shielding is good.

Replace discontinued HMI: If the original HMI is discontinued, GS-2 can be used as a substitute, but the hole size of 296 × 196 mm, installation hole spacing, 24V power supply, communication protocol, and project data need to be checked. SMM-2 supports multiple languages and printing, and the communication card determines the PLC protocol. After replacement, the project needs to be downloaded again and pre-set. If the communication card is not compatible, it is necessary to replace the communication card and update the firmware.

Technical data and compliance

GS-2 adopts electroluminescent display, with yellow background and black text, 640 × 400 pixels, 9 inches, display area of 194 × 122 mm, refresh rate of 70 Hz, and a viewing angle greater than 160 ° cone. The operation adopts TCL touch control logic, 39 × 25 infrared channels, and a logic resolution of 77 × 49. The communication card slot supports MPB-TP, 9-pin D-Sub female head, and can be configured with TTY, current loop, RS232, RS422 point-to-point or multi-point RS485。 Programming port RS232 isolated without grounding, maximum 20 meters. Printer port baud rate 1200 to 9600. The working climate ranges from 0 to 55 ° C, with a relative humidity of 20% to 80%; Storage climate -40 to 75 ° C, relative humidity 5% to 95%. Mechanical shock resistance IEC 68-2-27 (10 shocks, half sine 15g/11ms), vibration resistance IEC 68-2-6 (10 to 57Hz/0.15mm, 57 to 150Hz/2g). EMC compliance EN 61000-4-2（6kV/8kV）、ENV 50140（10V/m）、EN 61000-4-4（2kV）、IEC 801-5（0.5kV/2kV）、ENV 50141（10V）、EN 61000-4-8（10A/m）、CISPR 11/EN 55011 class B And class A. IP65 protection level requires additional installation kit. The equipment complies with EU Electromagnetic Compatibility Directive 89/336/EWG and Low Voltage Directive 73/23/EC, with basic standards of EN 50081-2, EN 50082-2, and EN 60950.

Maintenance and spare parts strategy

Daily maintenance includes: checking power supply voltage and current, checking SMM fixing and WRITE ENABLE position, checking communication cable shielding and connectors, cleaning screens and cooling troughs. Spare parts recommendations: SMM-1 or SMM-2, communication card, download cable, IP65 installation kit, power terminal. Before replacing SMM or communication card, power must be cut off and anti-static measures must be taken. Project data should be regularly backed up to a PC for replacement or recovery. If the GS-2 is completely discontinued, priority can be given to upgrading models of the same series, checking the compatibility of openings, power supply, communication interfaces, and SMM, and if necessary, recompiling the project through PDT.

As a classic touch visualization unit, the stability of MICRO PANEL GS-2 depends on correct installation, standardized cable shielding, and matching communication configuration. By using status masks and download masks, engineers can quickly determine whether the fault is located in memory, communication cards, PLC links, or project data. Mastering SMM operations, firmware updates, and debugging processes can significantly reduce downtime and make reliable decisions when replacing discontinued HMIs.