Description
You can schedule a program event with the S7-1200 PLC by the use of the attached "ClockAlarm" instruction.
With the "ClockAlarm" instruction, it is possible to schedule events once, or by the year, month, day, hour, minute or second.
The "ClockAlarm" instruction checks the system time against the configured parameters.

Scheduling a daily event with the "ClockAlarm" instruction
 

No.	Scheduling a daily event with the "ClockAlarm" instruction
1	Add the "ClockAlarm" global library Download the attached file "ClockAlarm.zip" to your PC and unzip it. In the "Libraries" pane > "Global libraries" click the "Open global library" button. Browse the "File manager" window, select the "ClockAlarm.al10" file and click the "OK" button. Fig. 01
2	Add the "ClockAlarm" instruction to your program Browse the "Libraries" pane > "Global Libraries > ClockAlarm" for the "ClockAlarm" instruction . Drag and Drop the "ClockAlarm" instruction into a network of your program. Fig. 02
3	Configure the "ClockAlarm" instruction for a daily event at  4.30 p.m. local time Please find detailed information on all contacts in the table "ClockAlarm parameters" below. Enable  the inputs "Enable hour", "Enable minute"  and "Local time" (set these contacts to "1"). Set the "Hour" input to "16" and the "Minute" input to "30". Disable all other inputs (set these contacts to "0"). Connect the "OUT" output to a "Bool" data type tag of your choice (for example M2.0 "WakeUp"). Connect the "Out_of_Range" output to a "Bool" data type tag of your choice (for example M2.1 "OutOfRange"). The digital output is set every day at 4.30 p.m. local time. See Figure 02 for details.

"ClockAlarm" parameters
Please find detailed information on all contacts of the "ClockAlarm" instruction in the following table.
 

Contact	Parameter	Data type	Value / Description
Input	Year	UInt	1970..2554
Input	Enable Year	Bool	"1" = Enable year evaluation, "0" = Disabled (not monitored)
Input	Month	UInt	1...12
Input	Enable Month	Bool	1" = Enable month evaluation, "0" = Disabled (not monitored)
Input	Day	USInt	0...31
Input	Enable Day	Bool	1" = Enable day evaluation, "0" = Disabled (not monitored)
Input	Hour	USInt	0...23
Input	Enable hour	Bool	1" = Enable hour evaluation, "0" = Disabled (not monitored)
Input	Minute	USInt	0...59
Input	Enable minute	Bool	1" = Enable minute evaluation, "0" = Disabled (not monitored)
Input	Second	USInt	0...59
Input	Enable second	Bool	1" = Enable second evaluation, "0" = Disabled (not monitored)
Input	Week	USInt	1...7; "-1" = Current day of the week, "1" = Sunday
Input	Enable week	Bool	1" = Enable week evaluation, "0" = Disabled (not monitored)
Input	Local time	Bool	"1" = Local time evaluation; "0" = system time evaluation
Output	Out	Bool	Actual data and time corresponds to the set point
Output	Out_of_Range	Bool	At least one invalid input; if "Out_of_Range" = 1, the "ENO" contact is set to false.

S7-1200_ClockAlarm.zip ( 335 KB )

Requirements

• S7-1200 PLC
• Ethernet cable
• PG / PC
• STEP 7 Basic V10.5