GE VMIVME-2128 128 bit high voltage digital output board

P2 user grounding option: The user grounding is connected to all B-row pins of the front panel connectors P3 and P4. If the P2 user grounding option is ordered, these grounds are also routed to pins A1 to A26 of the backplane P2 connector through the installation of short-circuit bars SB1 to SB4 (RP33 to 36). The external power supply grounding (user grounding) can now be accessed from the P2 backplane connector of the VME chassis. All 26 wires are required to provide a low resistance user load current return path. For a typical 300mA/channel load, the current of each wire can reach up to 1.48A. Each unused wire means that its current must be shared by the remaining wires, so 28 AWG or larger wires should be used.

Configuration and Installation

Unpacking procedure: Some components on GE Fanuc embedded system products may be sensitive to electrostatic discharge. When placing the board on a workbench for configuration and other operations, it is recommended to insert conductive material underneath the board to provide conductive diversion. Unused boards should be stored in their original packaging. After receiving the product, all precautions in the transport container should be followed, all items should be carefully unpacked, and a thorough inspection should be conducted for any transport damage. All claims arising from transport damage should be made to the carrier and a complete report should be sent to the GE Fanuc embedded system, requesting advice on the handling of damaged items.

Jumper and switch positions: Introduces the physical positions on the jumper, and the address modifier can change the configuration by installing the jumper at the appropriate position on connector H1, supporting multiple I/O access types. The address selection jumper is used to specify the starting board address for data transmission. The installed jumper is equal to zero, and the omitted jumper is equal to one. The factory default configuration is to respond to 0000 HEX in the short monitoring space.

I/O cable and front panel connector configuration: The output connectors (P3 and P4) on VMIVME-2128 are 96 pin DIN standard and can be used with various cables and matching connectors. Users can refer to the relevant application guide for more information. Detailed explanation of the use of user I/O pins and external voltage input for connector P2, as well as the pin configuration of output connectors for P3 and P4. The VMIVME-2128 board is designed with a high-quality ground plane, which is connected to the VME ground through fuse F1 and to the B-row pins on connectors P3 and P4 to enhance noise resistance and improve operational reliability. Users are also reminded that the grounding conductor should be connected to the power supply (GND return) associated with these signal loads, and the grounding connection should prevent excessive current (DC or noise) from flowing through the VME backplane. External user voltage should not be applied to VMIVME-2128 without connecting the VME backplane+5VDC. If these voltages cannot be applied and removed together, the preferred order is: user voltage is connected last and disconnected first.

Optional user grounding: If the user grounding option is ordered, the output return is routed to pins A1 to A26 of P2 through the installation of short-circuit bars SB1 to SB4, allowing access to the external power supply grounding from the P2 backplane of the VME chassis. It is important to maintain the grounding path resistance lower than the VME grounding path resistance and use as many wires as possible to lead out these grounding points. The current in the wires may be large, so 28 AWG or larger wires should be used, while being careful not to exceed the maximum current rating of the connector pins.

Preheating resistor: When the incandescent lamp is initially turned on, the cold filament resistor is the smallest, usually allowing 10 to 12 times the surge current. A surge current of 1A or greater will force the output driver to enter the return current limit. To avoid this problem, preheating or current limiting resistors should be used in the lamp circuit. The preheating resistor should consume about 10% of the rated (hot) current of the bulb. A ten pin SIP socket is provided on the board for preheating resistors, which must be bus type, with pin 1 as the common terminal and pin 1 of the socket grounded. The power rating of the preheating resistor should be sufficient to handle the required power consumption.

Programming

Register Mapping: VMIVME-2128 includes a 16 bit board ID register, a 16 bit CSR, and eight 16 bit ODRs, providing register address mapping. ODRs allow control of 128 high-voltage digital output channels, which can be addressed as four 32-bit long words, eight 16 bit words, or sixteen 8-bit bytes. ODRs can be read under program control for data verification or diagnostic testing. CSR and board ID can be addressed as 16 bit words or two 8-bit bytes, and ID and CSR bit mappings as well as ODR bit mappings are provided. The board uses a 32 byte address space.

Detailed programming: In output data transmission, the data register address mapping displays the correspondence between ODR (DR0 to DR7) and output data channels 127 to 0. The built-in testing function provides real-time loopback data verification and offline diagnostic execution capability. The offline built-in testing function is activated by setting the test mode (TM) bit in CSR to logic "zero". When the TM bit is set, all output drivers are in three states, and test data can be written into the selected data register and read back during read transmission without affecting the user device. When the test mode is turned off, the data can also be read back, allowing online testing of the board. The test mode bit and fault LED control bit are initialized to active state when powered on or system reset, so the fault LED lights up and the output driver is disabled. A simplified programming flowchart is also provided.