IbaLink-SM-128V-i-2O VMEbus interface board

3.2 On board DIP switch configuration

The onboard DIP switch (located at the bottom of the board) is used to configure deeper system parameters such as interrupts, data formats, memory addresses, etc. The factory default settings are usually marked with a yellow background.

Byte order and data format:

CH1/CH2-BIG-ENDIAN/LITTLE-ENDIAN: Set the byte order of channel 1/2.

CH1/CH2-REAL/INTEGER: Set the format of channel 1/2 analog data (IEEE floating-point or integer).

VME address mode and address settings:

A24/A32: Select 24 bit or 32-bit address mode.

A31... A18: Used to set the starting address of VMEbus. The board occupies 256 kByte of space, and the lower 18 bits of the address (A17... A0) are fixed to 0. Therefore, in the hexadecimal representation of the starting address, the last 5 bits are always 0 (such as 0xE0000000).

Special mode switch:

TEST: Only used for factory testing and must be set to OFF during normal use.

IRQ2/IRQ6: Interrupt setting, default turned off.

XXX: No functionality, keep default.

Configuration guide for specific PLC systems

The manual provides configuration recommendations for several common VME control systems, simplifying the integration process.

ALSPA CP80/A800 (AEG Logidyn D): A modified version SM128V with a 16 bit VME backplane is required. Recommend using A24 mode, starting address 0xE40000, Big Endian, integer data format. Manage memory mapping in LogiCAD through subroutines (UP).

ALSPA C80 HPC (Logidyn D2): Standard version SM128V can be used. The system has reserved a memory range of 512 kByte for up to 4 SM128V cards (actually using 256 kByte). The starting address is 0x7790000, in A32 mode. The parameter block "IBA_SM128V" needs to be used for programming in the application.

ALSPA C80 HPCI: The system is VxWorks and the programming system is ALSPA P80i. Configuration similar to HPC, starting address 0x7790000, A32 mode. Data needs to be written to VME memory using the VMEWRT function block.

GE 90/70: Recommended to use A24 mode, starting address 0xA00000, Big Endian, floating-point data format. During installation, it should be noted that the GE 90/70 chassis does not have guide pin holes, and it may be necessary to remove the guide pins on the SM128V.

Simatic TDC: Supports standard VME modules starting from D7-SYS 6.0 version. The address needs to be obtained by configuring the SB950 universal module. Special attention should be paid: No TDC module (such as CP51M1, CP52A0) should be inserted on the right side of the SM128V card, otherwise it will cause the system to fail to start. The reason is that the SM128V slot will block the initialization signal to the right TDC module.

System topology and application scenarios

The flexibility of SM128V is reflected in its ability to adapt to various system topologies and meet different application requirements.

5.1 Peer to Peer Operations

Scenario: Connect two VME systems to achieve data exchange between them.

Configuration: Set at least one SM128V mode switch to 8. At this time, the memory data of the two VME systems will be periodically (1ms) transmitted to each other, with 64 analog and digital signals in each direction.

Advantage: No additional software or power is required, enabling direct and high-speed communication between VME systems.

5.2 ibaPDA Data Collection Application

Scenario: Collect data from the VME system into ibaPDA software on the PC for recording, analysis, and visualization.

Topology: The SM128V fiber optic output interface (Tx) is connected to the input interface of the PC side ibaFOB-io or ibaFOB-4i (- S) acquisition card. Both channel 1 and channel 2 can be used as outputs.

Engineering note: In ibaPDA 5.20 and above versions, two "SM128" modules can be assigned to each fiber link, supporting gain and bias scaling of signals. Early versions required the allocation of the "ibaLink-SM-64-io" module, which does not support scaling.

5.3 ibaLogic Control Application

Scenario: Use the VME system as I/O and collaborate with ibaLogic soft PLC on the PC to achieve closed-loop control.

Topology: The output (Tx) of SM128V is connected to the ibaFOB acquisition card (input to ibaLogic). At the same time, the input (Rx) of SM128V is connected to the ibaFOB output card (output from ibaLogic). Form a bidirectional data stream.

Engineering note: In ibaLogic, use FOB-F/FOB-IO resources to receive data from SM128V, and use FOB-F OUT/FOB-IO OUT resources to send data to SM128V.

5.4 Cascade Mode

Scenario: When the number of signal points to be collected exceeds the 64 channels of a single SM128V, the number of channels is expanded through cascading.

Topology: Up to 8 SM128V modules can be connected via daisy chain. The output of the first block (Tx) is connected to the input of the second block (Rx), and so on. The complete message (64 signals) containing all board data will ultimately be transmitted to the backend acquisition or control system.

Configuration: Set the mode switch S1 of each board to 0, and allocate their respective positions in the total message through the S2 (range) and S3 (address) switches. Attention should be paid to the data flow: the incoming message will overwrite the corresponding part in the local RAM.