��� ��������������������� The BVME250 is a compact 3U VMEbus module providing up to 32 single Up to 32 analogue inputs ended analogue input channels or 16 differential inputs. The inputs are selected via the input multiplexer and scaled by the precision instrumentation amplifier before being converted by the A to D converter. Full 12 bit resolution 11μsec. worst case conversion time Switchable input voltage ranges of 20mv 200mv 2v 20v full scale Single ended or differential input operation Unipolar or bipolar operation Single Eurocard 3U form factor with 6U front panel option Fully compatible with A resolution of 12 bits is available with a worst case conversion time of VMEbus specification C.1 11μsecs. Communication with the VMEbus is via registers in the short I/O address space and on-board interrupt generation and acknowledge are provided. Fully supported with OS-9 drivers and ‘C’ bindings ��� specific applications. The PIM connects to the BVME250 via ribbon The BVME250 has 32 analogue input cable providing a simple transition channels which can be configured between computer and plant wiring. individually for single ended input or as pairs to provide 16 independent differential inputs. The input signal is selected via the analogue mux and fed to a precision instrumentation amplifier. This amplifier has a link selectable gain of 1, 10, 100 or 1000. The gain of the amplifier may also be controlled in software via the channel select register. The output from the instrumentation amplifier is fed to the Analogue to Digital converter which has a sensitivity of 10 or 20 Volts. This allows the user to select the best gain/sensitivity match for a particular application. Worst case conversion time is 11μS which includes 2μS sample and hold time. If the channel selected register has been written to a further 15μS is added to the conversion time to allow the input amplifiers and multiplexer to settle. Analogue Inputs 32/16 Single ended/differential The BVME250 occupies 256 bytes in Gain 1, 10, 100 or 1000 the short I/O address space. There ADC range 0 - 10, 0 - 20 Volts VMEbus Slave are 6 registers each of 16 bits, A16:D16, D8(OE) accessible to the user. The base AM6, RMW Interrupter address can be located on any I(1-7) Single level RORA. Link 256byte boundary by link selection. select. SYSRESET Monitor Interrupts can be generated on any Links Register Base Address individual link selectable level I(1-7) Interrupt level These operate on a Release on Amplifier gain Differential/Single ended operation Register Access mode (RORA). Unipolar/Bipolar operation Dimensions 160mm x 100mm Single slot Power A DIN rail mounting Plant Interface +5V, 750mA Typ +12V 0.0A Module (PIM) is available to simplify -12V 65mA cable termination by providing screw Environmental 0 to 70°C connectors and also provides a 95% humidity non-condensing mounting for any signal conditioning (extended specification available to order) resistor or capacitors required for BVM Limited Hobb Lane, Hedge End, SOUTHAMPTON, SO30 0GH, UK Tel +44 (0)1489 780144 Fax +44 (0)1489 783589 Printed in the UK BVME250/1 All trademarks acknowledged.