====== Operating hours counter ======

{{:en:mervis-ide:35-help:t32.png}}

===== Block name =====

T32_OPERATING_HOURS

===== ST call =====

<code st-iec>
PROGRAM TEST_T32
   VAR 
        BOOL1,BOOL2,BOOL3: BOOL;
        TIME1,TIME2:TIME;
       DT1: DT;
        FB: LIB.HVAC.V1_0.T32_OPERATING_HOURS;
  END_VAR
 FB(BSET:= BOOL1, ENABLED:= BOOL2, IN:= BOOL3,TINIT:= TIME1, OUT=> TIME2, TSET=>DT1);  
END_PROGRAM
</code>

===== Library =====

LIB\HVAC

===== Version =====

V1.0

===== Description =====

The block measures total activity time of a binary input, or cumulated operating time of the connected aggregate (pump, fan, boiler).\\


===== Inputs =====

|Input |Type|Description                                         |Default value|
|BSET  |BOOL|Rising edge sets the counter to //TINIT//           |False        |
|ENABLE|BOOL|This input must be //TRUE// for the block to operate|False        |
|IN    |BOOL|Activity input                                      |False        |
|TINIT |TIME|“Starting” value after reset, usually 0             |0            |

===== Outputs =====

|Output|Typ |Description                                             |
|OUT   |TIME|Total time the //IN// input was in //TRUE//             |
|TSET  |DT  |Date and time of last reset (rising edge on BSET) as UTC|

===== Function =====

The block acts as a stopwatch. Time measuring start is activated by bringing the //IN// input to True, and stopped by bringing //IN// to False. The default state is set by a rising edge at //bset//, while the block writes the //TINIT// value to the //OUT// output rather than the cumulated time. This becomes the starting value for further cumulation. //TSET// records the rising edge time.

===== Application example =====

{{:en:mervis-ide:35-help:t32_example.png}}

The variable //PUMP1FB// gives the pump operation signal. The cumulated time is recorded in T32 and of the total operation time exceeds //PUMP_SERVICE_TIME//, an alarm to call for service inspection is generated.