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--- cubloc:connecting_a_backup_battery_to_cb290_cb405:index [2023/04/17 13:27]
COMFILE Technology [Additional Information]
+++ cubloc:connecting_a_backup_battery_to_cb290_cb405:index [2023/04/18 11:46] (current)
COMFILE Technology
@@ Line 1: / Line 1: @@
-====== Connecting a Backup Battery to the CB290 / CB405 / CUTOUCH ======
+====== Backup Battery ======
 ===== CB290 / CB405 =====
@@ Line 13: / Line 13: @@
 the case of an emergency.
-{{ :cubloc:connecting_a_backup_battery_to_cb290_cb405:backupbattery.png?500 }}
+{{ :cubloc:connecting_a_backup_battery_to_cb290_cb405:backupbattery.png? }}
 ==== Power Features ====
@@ Line 32: / Line 32: @@
 SIN, SOUT, and ATN, please do not connect them to anything.
-===== CUTOUCH =====
+===== CT1721C =====
+The CT1721C will maintain data in its volatile memory when powered off by using a backup battery. If backup is not needed, the program should clear the memory at the beginning of the program.
+<code xbasic>
+Const Device = CT1720
+Dim TX1 As Integer, TY1 As Integer
+TY1 = 0       ' Clear only TY1
+</code>
+Use [[cubloc:ramclear:index|RamClear]] to clear all data memory at the start of your program.
+<code xbasic>
+Const Device = CT1720
+Dim TX1 As Integer, TY1 As Integer
+RamClear      ' Clear all RAM, both TX1 and TY2
+</code>
+To add a backup battery to the CT1721C, connect a 3V battery to the "Batt. Backup" terminal on the back, bottom right side of the CT1721C and leave the "JUMPER_SUPERCAP" open.  To use a super capacitor instead of battery, connect the super capacitor to "Batt. Backup" and short the "JUMPER_SUPERCAP" terminal to enable charging while the power is on.
+{{ :cubloc:connecting_a_backup_battery_to_cb290_cb405:cutouch_battery.png }}
+In Ladder Logic, all registers S, M, C, T, and D are retained by the backup battery. Register P is cleared by default when the device is powered on. If you only want to clear parts of a register, rather than all registers, use the following method:
+<code xbasic>
+Const Device = CT1720
+Dim i As Integer
+For i=0 to 32   ' Clear only M0 to M32
+ _M(i) = 0
+Next
+Set Ladder On
+</code>
+[[cubloc:index|CUBLOC - Embedded Controller]]

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