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ISOLATED I/O
The 7I95 has 24 isolated inputs and 6 isolated outputs. All 24 Isolated
inputs have a common pin per input pair. This common pin must be connected to ground
for active high inputs and connected to the I/O power for active low inputs. The 6 isolated
outputs are completely floating switches so can be use for pull-up/pull-down and mixed
voltage switching.
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OPERATION
ISOLATED INPUT CHARACTERISTICS
The isolated inputs use opto-isolators with a 4.7K input series resistance. This
results in an approximate current draw of 5 mA at 24V. The inputs will operate with +-4V
to +-36V signals relative to input common. Isolated inputs are relatively slow and not suited
for signals faster than about 5 KHz. Each input pair has a separate common connection
to allow mixing of sinking/sourcing and mixed supply voltages.
For PNP type sensors or switches with a common positive, the input common pin
for a given input pair is grounded.
For NPN type sensors or switches with a common ground, the input common for a
given input pair is connected to +5 to +36V and the input pins are grounded to activate an
input.
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