2-4
Functional Description
Functional features of a PIO-SSR Series board are described as follows:
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Using software, you can set each port as an input or an output.
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The capacity of each channel (when set as an output) is 24mA of sink
current or 15mA of source current, allowing a board to drive
industry-standard solid-state relays. The SSRs allow up to 4000V
rms
of isolation and AC or DC voltage sensing up to 240V.
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All channels in all ports are TTL-compatible and are not electrically
isolated from external circuits.
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Channels on any PIO-SSR Series board are structured in groups of
24; a PIO-SSR-24 contains one 24-channel group, a PIO-SSR-48
contains two 24-channel groups, and a PIO-SSR-120 contains five
24-channel groups.
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Each 24-channel group is accessible through an onboard, 50-pin,
male connector whose pin assignments are compatible with the
industry-standard PB-24 and PB-24SM solid-state-relay-module
baseboards.
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Each 24-channel group emulates the Mode 0 operation of the Intel
8255A PPI (Programmable Peripheral Interface) integrated circuit.
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A single group comprises three 8-channel ports whose designations
are Port A, Port B, and Port C.
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While Port A and Port B are each used as 8-channel ports, Port C is
used as one 8-channel port or two 4-channel ports.
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Input channels C0 and C3 of every Port C on a board can each
generate an interrupt request (IRQ) signal for gating into a single,
jumper-selectable IRQ level.
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The IRQ levels supported by PIO-SSR Series boards are 3 to 7, 9 to
12, 14, and 15.
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The input requirement for an interrupt is the rising edge of a
TTL-compatible input signal.
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You can disable the interrupts through software.
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