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read RTC

Created by: adad at: 6/13/2009 3:31 PM (2 Replies)

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6/13/2009 3:31 PM	Rate (0)
adad Posts: 3 Rating: (0)	Hello, I've used system below to read PLC clock and transfer year, month, day, hour, minute, sec and day of week to DB10 in order to compare the data afterwoods with preset values. As shown in FAQ's : How can you read out the date and time with SFC1 (READ_CLK) and input them with SFC0 (SET_CLK)? When i use PLCSIM to check values bytes representation in FC1 gives me correct date and time. Also value next p.e. PLC_CLOCK_DB.dag is correct. When i monitorDB10 = PLC_CLOCK_DBgiven values don't correspond anymore with values as shown in monitoring FC1. Does anyone knows the reason why this happens? NW1 CALL "READ_CLK" RET_VAL:=MW84 CDT :=#out_date_time NW2 LAR1 P##out_date_time L B [AR1,P#0.0] T #jaar_B L B [AR1,P#1.0] T #maand_B L B [AR1,P#2.0] T #dag_B L B [AR1,P#3.0] T #uur_B L B [AR1,P#4.0] T #minuten_B L B [AR1,P#5.0] T #seconden_B L W#16#FFF0 L W [AR1,P#6.0] AW T #ms_B L B#16#F L B [AR1,P#7.0] AW T #weekdag_B CLR NW3 : L #jaar_B T "PLC_clock_DB".jaar L #maand_B T "PLC_clock_DB".maand L #dag_B T "PLC_clock_DB".dag L #uur_B T "PLC_clock_DB".uur L #minuten_B T "PLC_clock_DB".minuten L #seconden_B T "PLC_clock_DB".seconden L #ms_B T "PLC_clock_DB".ms L #weekdag_B T "PLC_clock_DB".weekdag CLR Thanks
adad Posts: 3 Rating: (0)
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6/13/2009 5:45 PM	Rate (0)
Ayman Elotaify Diamond Expert Joined: 5/28/2008 Last visit: 1/12/2026 Posts: 4522 Rating: (843)	Hello, Have you seen this FAQ? Regards,
	Ayman Elotaify
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6/14/2009 2:01 PM	Rate (0)
Sydney Gold Member Joined: 1/4/2008 Last visit: 12/22/2025 Posts: 703 Rating: (98)	Hello, as first - you don't need that additional TEMP variables, you can trasferthe DT partsdirectly to the DB variables. Also I suggest to use the AR2 in functions and here the area internal indirect addressing (e.g. L LB [AR2,P#0.0])because it's faster. Are you sure that you don't use the DB also somewhere else? Regards Sydney
	Last edited by: Sydney at: 6/14/2009 2:07 PM Last edited by: Sydney at: 6/14/2009 2:05 PM
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