This figure shows the pin diagram of the Hour_Meter function block:
The Hour_Meter function block is used for accumulating the operating hours of various devices.
oIf an error is detected, time is not calculated for the period till the detected error is acknowledged after which time calculation resumes from the value at the arrival of detected error. Hence, if the device for which UP time is being calculated is active during the error detected state, then the accumulated time is lesser than the actual time.
oFor a wrong value of time unit specified in the variable i_strPara.wTypeTime, the function block displays the previous value of calculated time when the time unit input is correct, but the function block does not inform the user about this erroneous condition.
oEven if the block is locked by the external Interlock input, the function block can receive, generate and display a detected error.
oIn Locked mode, the function block can reset the detected error by receiving the acknowledgement input.
oThe calculated time value at the output is only in seconds or minutes or hours. The user should convert it into a format like HH:MM:SS if required.
oThe structure variable i_strPara holds the warning time value and the time unit. The user must take special precaution not to accidentally change the time units as this can result in false alarm generation.
The accumulation can take place either in manual mode or automatic mode:
oAutomatic Mode: The automatic mode is selected through the input pin i_xAut. When the input i_xIn is set to TRUE the block accumulates the time and stops when the i_xIn is set to FALSE. The accumulated time is available at the output pin q_diHr.
oManual Mode: The Manual mode is activated by the pin i_xMan. When the input i_xIn is set to TRUE the block accumulates the time and stops when the i_xIn is set to FALSE.The accumulated time is available at the output pin q_diHr. The accumulation can be inhibited by the command bit i_dwCtrl.
The block is de-activated on controller start and remains in the specified mode until a new one is selected. If both inputs are set to 1, then the operation mode is invalid.
The reset of the output q_diHr is executed by a rising edge at the input i_xRst in automatic mode or by a command bit in manual mode.
The reset value of the output q_diHr is set to the value i_strPara.diSp (Set Point). Additionally the detected signal q_xWarn is set, when the output q_diHr exceeds the detected error limit specified by the parameter i_strPara.diWaitTime.
The parameter i_strPara.wTypeTime sets the unit of the output value. The selectable are seconds, minutes and hours. The accumulation function does not depend on this value, but is always done on the base of seconds.
The counting takes place only, if the interlock input i_xLock is set to FALSE. An active interlock signal inhibits the operation of the hour meter. An active interlock is indicated at the output q_xLock.
The function block sets the detected error signal, if the detected error input i_xErr is set to TRUE (external detected error) or if the operation mode is invalid (internal detected errors). The detected errors are indicated in the HMI. To reset the detected error output the detected error has to be acknowledged by a rising edge on the input i_xAckn or by using bit 16 of the signal i_dwCtrl.
