ABB REL 551 2.3 Series - Page 43

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Checking the binary I/O circuits &KDSWHU
&KHFNLQJWKHH[WHUQDOFLUFXLWU\
 &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.