Impulse SCMPB01 - Manual (Page 4)

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Isolated Analog Signal Conditioning Products SCM5B
SCM5B
SCMPB02
16-Position Analog I/O Backpanel, Multiplexed
Description
The SCMPB02 16-channel backpanel (Figure 5) can accept any of the SCM5B
analog modules in any mixture. It can be mounted on the SCMXRK-002 19-
inch metal rack. The SCMPB02 has two analog buses; one for analog input
and one for analog output. This two-bus configuration takes advantage of the
switch controlled outputs on the input modules and the track-and-hold inputs on
the output modules. A temperature sensor is mounted on each channel to
provide cold junction compensation for thermocouple input modules (See
Figure 6 for schematic). Field connections are terminated with four screw
terminals at each module site. Up to four SCMPB02 backpanels may be daisy-
chained. Use SCMXCA004-XX cable for daisy chaining and connecting to host
computer.
Figure 5: SCMPB02 Analog I/O Backpanel
Specifications
Operating Temperature –40°C to +85°C
ATEX Group II, Category 3 –20°C to +40°C
Relative Humidity 95% non-condensing
Interface Connector:
Field high density screw clamp, 14 AWG max
System 26-pin, male header connector
Address Input Logic Levels:
Max Logic “0” 0.8V
Min Logic “1” 2.0V
I
I
Input Current, “0” or “1” 0.1µA max at 25°C
1.0µA max –25°C to +85°C
RD EN\ or WR EN\ Signal
Delay from Connector P1 to
Channels 1-16
Standalone (address 0-15) 51ns at 25°C
64ns at –25°C to +85°C
Expanded (address 16-63) 100ns at 25°C
126ns at –25°C to +85°C