Description
Technical Parameters
Product Introduction
The Analog Input/Output (IS200VAICH1D) board accepts 20 analog inputs and controls 4 analog outputs. Each terminal board accepts 10 inputs and 2 outputs. Cables connect the terminal board to the VME rack where the VAIC processor board is located. VAIC converts the inputs to digital values and transfers them over the VME backplane to the VCMI board,and then to the controller. For outputs, the VAIC converts digital values to analog currents and drives these through the terminal board into the customer circuit.
Technical Specifications
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Manufacture |
General Electric(GE) |
|
Model |
IS200VAICH1D |
| Part Number | IS200VAICH1D |
|
Description |
VAIC Analog Input/Output
|
|
Origin |
USA |
|
Dimension |
30*20*6cm |
|
Weight |
0.35kg |
Product Details
IS200VAIC supports both simplex and triple modular redundant (TMR) applications. When used in a TMR configuration, input signals on the terminal board are fanned out to three VME board racks R, S, and T, each containing a VAIC. Output signals are driven with a proprietary circuit that creates the desired current using all three VAICs. In the event of a hardware failure, the bad VAIC is removed from the output and the remaining two boards continue to produce the correct current. When used in a simplex configuration, the terminal board provides input signals to a single VAIC, which provides all of the current for outputs.
Installation：
To install the V-type board
1. Power down the VME processor rack
2. Slide in the board and push the top and bottom levers in with your hands to seat its edge connectors
3. Tighten the captive screws at the top and bottom of the front panel
Note Cable connections to the terminal boards are made at the J3 and J4 connectors on the lower portion of the VME rack. These are latching type connectors to secure the cables. Power up the VME rack and check the diagnostic lights at the top of the front panel. For details, refer to the section on diagnostics in this document.
In a TMR system, analog inputs fan out to the three control racks from JR1, JS1, and JT1.The 24 V dc power to the transducers comes from all three VME racks and is diode OR selected on the terminal board. Each analog current output is fed by currents from all three VAICs. The actual output current is measured with a series resistor, which feeds a voltage back to each VAIC. The resulting output is the voted middle value (median) of the three currents.
IS200VAIC Diagnostics
Three LEDs at the top of the VAIC front panel provide status information. The normal RUN condition is a flashing green, and FAIL is a solid red. The third LED displays STATUS and is normally off, but displays a steady orange if a diagnostic alarm condition exists in the board. Diagnostic checks include the following:
• Each analog input has hardware limit checking based on preset (non-configurable) high and low levels set near the ends of the operating range. If this limit is exceeded a logic signal is set and the input is no longer scanned. If any one of the input's hardware limits is set, it creates a composite diagnostic alarm, L3DIAG_VAIC, which refers to the entire board. Details of the individual diagnostics are available from the toolbox. The diagnostic signals can be individually latched, and then reset with the RESET_DIA signal.
• Each input has system limit checking based on configurable high and low levels.These limits can be used to generate alarms, and can be configured for enable/disable,and as latching/non-latching. RESET_SYS resets the out of limits.
• In TMR systems, if one signal varies from the voted value (median value) by more than a predetermined limit, that signal is identified and a fault is created. This can provide early indication of a problem developing in one channel.
• Monitor D/A outputs, output currents, total current, suicide relays and 20/200 mA scaling relays; these are checked for reasonability and can create a fault.
• TBAI has its own ID device that is interrogated by VAIC. The board ID is coded into a read-only chip containing the terminal board serial number, board type, revision number, and the JR, JS, JT connector location. When the chip is read by the I/O processor and a mismatch is encountered, a hardware incompatibility fault is created.