ABB REL 551 2.3 Series Installation And Comissioning Manual page 43




Checking the binary I/O circuits
&KHFNLQJ WKH ELQDU\ ,2 FLUFXLWV
%LQDU\ LQSXW FLUFXLWV
Preferably, disconnect the binary input connector from the binary input cards. Check all
connected signals so that both input level and polarity are in accordance with the termi-
nal's specifications.
%LQDU\ RXWSXW FLUFXLWV
Preferably, disconnect the binary output connector from the binary output cards. Check
all connected signals so that both load and polarity are in accordance with the terminal's
specifications.
&KDSWHU 
&KHFNLQJ WKH H[WHUQDO FLUFXLWU\
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