HA_CS31_CTD - HA Down Counter¶
Function block HA_CS31_CTD
| Available as of PLC runtime system | V1.3 and above |
| Included in library | HA_CS31_AC500_V13.lib (V1.3) and above |
| Type | Function Block with historical values. |
This function block is a standard down counter with automatic data synchronization in a high availability application.
Note
Only internal variables and outputs are synchronized. Input variables and parameters are not synchronized. If needed, use HA_CS31_DATA_SYNC to achieve the same.
If parameter LOAD=TRUE, parameter CV (Counter Variable) will be initialized with the upper limit of PV (Preset Value). If parameter CD (Count Down) has a rising edge from FALSE to TRUE, CV will be lowered by 1, provided that CV > 0 (i.e., it does not cause the value to fall below 0).