Sulzer ABS PC 441 - 4 Further Explanations about some Digital;Analog Output;Input Types; Logic IO

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4 FURTHEREXPLANATIONSABOUTSOME
DIGITAL/ANALOGOUTPUT/INPUTTYPES
4.1 Logic IO
One of the options in the functions of Digital out is Logic IO.Thisfunctionisespeciallyusefulifyouwantto
triggeranoutputsignalwhenmorethenonecriteriaoreventsareneededtobeforlledforanoutputsignal.
Thereareuptofourdi󰀨erentcriteriathatcanbeusedtotriggertheoutputsignal.ThoseIObitscaninteract
as a True OR, Inverse OR, True AND and Inverse AND functions or as a combination of these for one and the
same output. The output signal can be set to Normally closed or Normally open(NC/NO).
ThisIOcanbeusedtogetaspecicoutputsignalforoneorseveralindicatorsfromCA441orCA442e.g.
hightemperature,leakage,oranyothersIO-bitsofyourchoice.
• Anexampleofwherethisfunctioncanbeusefuliswhenyouwanttohaveonedigitaloutputsignal
tobeactiveforaspecicalarminanypumps,forexampleHightemperaturealarm.
ThefollowingdiagramisanexamplehowthreeIO-bitinteractwitheachotherinthefunctionofLogicIO:
IO-bit 1
“OR”
IO-bit 2
“OR”
IO-bit 3
“AND”
Output
0 0 0 0
InthisexamplethereareonlythreeIO-bitsinvolved.
ButyouhavetheoptiontouseuptofourIO-bits.
0 0 1 0
0 1 0 0
0 1 1 1
1 0 0 0
1 0 1 1
1 1 0 0
1 1 1 1
See the Comli/Modbus register manual regarding the IO-bit list.
Example Intheexamplebelow,DO1inPC441willbeactivatedifanyofthetemperaturealarmsconnectedtoCA442trips.
Tocongure,rstrefertotheIO-bitsinComli / Modbus manual for PC 441 and further to Pump status on chart
1.2;thereyoundIO-bit28,29and30whichareforthedi󰀨erentIO-bitsfortemperaturealarmsonpump1:
Figure 4-1 AbovechartisanextractfromtheComli/ModbusmanualforPC441-Pumpstatus.
TheninthemenuinCA511gointo:
- Settings / Digital outputs / Digital output 1 to [Logic IO]andtypeinaccordingtopicturebelow: