A-1
A
Specifications
Specifications for PIO-SSR Series boards are listed in the following
tables.
Table A-1. Digital Input/Output Specifications
Feature
Value
Number of channels
PIO-SSR-24
PIO-SSR-48
PIO-SSR-120
24, bidirectional
48, bidirectional
120, bidirectional
I/O interface
One 8255A Mode 0 emulation circuit for
each group of 24 channels
I/O signal
LS-TTL, non-isolation
Pull-up resistors
10k
Ω
, one per channel
Table A-2. Interrupt Request Specifications
Feature
Value
Input channels
C0 and C3 of each 24-channel group
Active transition
Rising edge of TTL input signal; minimum
pulse duration is 100ns
IRQ levels
3 to 7, 9 to 12, 14, and 15
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