MSXB 029: Analog Backplane Interface Board
Technical Note TN-184 Version 1.2
The Microstar Laboratories Analog Backplane Interface Board, part number MSXB 029, interfaces the Analog Backplane with the DAP. The Analog Backplane Interface Board must be installed in the Analog Backplane to connect the backplane to the DAP.
An optional stand-alone model of the Analog Backplane Interface Board provides analog power to analog external boards for use outside of the Analog Backplane.
Hardware Configuration
The Analog Backplane Interface Board can be installed into any free slot of the Analog Backplane. When installing the Analog Backplane Interface Board, push the board firmly into the slot and make sure the board is securely connected to the Analog Backplane. Secure the Analog Backplane Interface Board front panel to the Industrial Enclosure with the two screws provided.
Warning: Never install a board into the Analog Backplane or remove a board from the Analog Backplane while the Analog Backplane is powered.
The Analog Backplane Interface Board connects to the DAP through connector J2 by means of the MSCBL040 shielded cable or the MSCBL041 ribbon cable.
Connector J3 provides the option of connecting another analog backplane in a daisy-chain by means of the MSCBL060 panel-mount cable. The MSCBL060 cable would be installed into the adjacent slot on the right side of the Analog Backplane Interface Board. Another analog backplane would connect to the MSCBL060 cable.
On the optional stand-alone model of the Analog Backplane Interface Board, connector J1 is used to connect to external boards by means of the MSCBL040 shielded cable or the MSCBL041 ribbon cable.
This model can not be installed in the Analog Backplane. Connector J2 or J3 is connected to the DAP, similar to the standard models.
Power Consumption
The Analog Backplane provides power to each slot by means of three voltage supplies: +5V, +18V, and -18V. If the total power consumption of all external boards installed in the Analog Backplane does not exceed the DAP's power availability, the Analog Backplane can draw power from the DAP. If the total power consumption exceeds this limit, external power must be supplied to the Analog Backplane. Please refer to the hardware documentation of the Analog Backplane and external boards for more information on power consumption.
The Analog Backplane Interface Board has external power models to meet the power consumption requirements of a system. If the power consumption of the system does not exceed the DAP's power availability, the MSXB 029-03-E2A model or the stand-alone MSXB 029-03-A2Z of the Analog Backplane Interface Board is used. These models use power from the DAP's +5V supply to generate the +18V and -18V supplies and provides them for the Analog Backplane or the analog system. These models also distribute the DAP's +5V supply directly to Analog Backplane or to the analog system.
If the system requires external power, the MSXB 029-04-E2A model or the stand-alone MSXB 029-04-A2Z model of the Analog Backplane Interface Board must be used. In these models, the DAP's +5V supply is separated from the backplane's +5V supply. For a backplane system, an external +5V supply must be connected directly to the Analog Backplane. The MSXB 029-04-E2A uses power from the backplane's external +5V supply to generate the +18V and -18V supplies and provides them for the backplane.
For the stand-alone MSXB 029-04-A2Z model, an external +5V supply must be connected to J4 of the Analog Backplane Interface Board. Connector J4 is a male Molex connector part number 26-60-4030 and mates with the Molex connector part number 09-50-3031. The mating connector is included with the Microstar Laboratories cable kit MSCBL 027-01K.
Figure 1. External Power Connector
Pin 1 is nearest to connector J3 on the board.
All models of the Analog Backplane Interface Board convert power from +5V to +18V and -18V with an efficiency of 80%. This efficiency must be considered in calculating the power consumption of a backplane system. Please refer to the hardware documentation of the Analog Backplane for information on calculating power consumption.
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