
APPENDIX B. SIGNAL-20P BLOCK SCHEME
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Appendix B. SIGNAL-20P block scheme
processor
commu-
tator
loop 1
loop20
voltage converter
27V
"Ready"
indicator
RS-485
loop
power dump unit
switching
relays (1, 2, 3)
circuit control
outputs (4, 5)
interface
voltage converter
5V
power
supply U1
power
supply U2
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