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Home > Libraries > ID 0011 > Detail

LOGO! Hour counter


Step7-MicroWin:	[V4.0]

CPU:	[all CPU22x]

Operating system:	--

Other:	--

Author:	Damir Krdzalic	Homepage:	http://www.damir.com

Created:	28.09.2004	License:	Freeware

Update:	05.11.2004	Price:

Views:	553	Downloads:	195

QUESTION:
How to realize the LOGO!-Function Hour counter in STEP 7 Micro/WIN ?

ANSWER:
The following library emulates the Hour counter function in S7-200. Additional features compared to LOGO Version are the time is shown Hours and Minutes, the max amount of blocks are limited only trough the CPU program-memory size.

The Library "Logo functions V1.2" add the "Hour counter" function. The functions "Pulse_Relay" and "Weekly_timer" are described in previous entries, see the links at bottom of this entry.

Description:
The Hour counter contains 2 Functions. On one side he shows the left operating time, on the other side he contain a configurable maintenance timer wich shows when the next service interval would be reuired.

Hour counter

Parameter	Variable Type	Explication
EN	[BOOL]	enabling Function, should be always TRUE(1)
Input	[BOOL]	signal input, function is enabled as long Signal TRUE(1) applied
Reset	[BOOL]	at Signal TRUE(1), reset Time MN to starting value MI
RAL	[BOOL]	at Signal TRUE (1), reset Time OT to 0 and MN on starting value MI
MI	[WORD]	preselect, maintenance interval in hours[1..65535]
Q	[BOOL]	Q=0 -> reset OUT if Reset=1 or RAL=1 Q=1 -> reset OUT if Reset=1 or RAL=1 or IN=0
Memory	[DWORD]	temporary memory
MN_h	[WORD]	remaining time up to maintenance interval (Display for Hours) [0..65535]
MN_m	[WORD]	remaining time up to maintenance interval (Display for Minutes) [0..59]
OT_h	[WORD]	accumulated operating time (Display for Hours)) [0..65535]
OT_m	[WORD]	accumulated operating time (Display for Minutes) [0..59]
Output	[BOOL]	signal output, Signal TRUE(1) if maintenance interval timer MN = 0

Functionality:
The hours counter monitors input "IN". When "IN" = 1, the function computes the time expired and the time-to-go MN. The function shows these times at parameters "MN_h", "MN_m", "OT_h" and "OT_m".

Output "Q" is set when the time-to-go MN = 0. A signal at input "Reset" resets output "OUT" and sets the preset value of "MI" at the counter for the duration of MN. The hours counter OT continues the count.

With a signal at the reset input "RAL", you reset output "OUT" and set the preset value of "MI" at the counter for the duration of MN. The hours counter OT is reset to zero.

Depending on your configuration of parameter "Q",
Q=0 -> OUT is reset with a signal at input "Reset" or "RAL" (Reset OR RAL are High -> Q=0).
Q=1 -> OUT is reset with a signal at input "Reset" or "RAL" or "IN"=0 (Reset OR RAL are High OR IN is Low -> Q=0).

Limit value of OT
The value of the operating hours in OT are retained when you reset the hours counter with a signal at input "Reset". The hours counter OT continues the count as long as IN= 1, irrespective of the status at the reset input "Reset".
The counter limit of OT is 65.535 h (~7,4 years).
If the counter overflow this value it starts at 0 again.
The initial value of OT could be preset. The function should not run at this time.

Notice:
To prevent a loss of process values the Parameters MN_h, OT_h (if required MN_m, OT_m) should be stored frequently. These values could be stored into the internal Eeprom or at CPUs with Firmware Rel>= 2.0 into the external Eeprom. Keep in mind that the values could be written to the Eeprom only about 100.000 times. If you store the data into the CPU internal eeprom the CPU will be DAMAGE otherwise the memory cartridge. DO NOT STORE the Data continuously at high frequency.

Example:
If you store the data every hour the eeprom would live up to 11-12 years.

Internal Eeprom Library :
see links at the bottom of this entry

External Memory cartridge: (CPU Firmware >= Rel 2.0) :
use the Data logging wizard

History
Version:	Fixed / Changed:
V1.3	- add LOGO! random generator
V1.2.2	- absolute address Q0.0 used in program. Only affected when time MN was passed and IN=0

Download (36 KB)

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Last Forum topics regarding this entry:

	error message while library import	08.10.04 18:16
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Similar entries wich could interrest:

	ID 0006	Library	LOGO! Pulse Relay
	ID 0009	Library	LOGO! Weekly timer
	ID 0002	Library	Internal Eeprom
	ID 0026	Workshop	Exchange libraries properly on updates
	ID 0031	Library	LOGO! Random generator

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