CNT_IO_EXT¶
Note
The fast counter which is integrated in CPUs PM55x and PM56x (Onboard I/Os) can only be managed by Function Block ONB_IO_CNT ONB_IO_CNT (and not by CNT_IO_EXT).
| Parameter | Value |
|---|---|
| Library_File_Name | Counter_AC500_V20.lib |
| Available as of PLC runtime system | V2.0 |
| Available as of S500 I/O device firmware: | V1.3 |
| Type | Type_Function_Block_History |
Function Block CNT_IO_EXT is used to control the fast counter of the digital S500 I/O Modules.
The operating modes of the fast counters are described in detail in a separate chapter: Fast Counter
To activate the fast counter of a digital S500 I/O Device, the parameter “fast counter” of the I/O device must be set to the desired counting mode in the control system configuration.
Data exchange between CPU and fast counter is done using input/output data. The following is required for the counter:
- 2 bytes digital inputs for status bytes 0 and 1
- 4 words analog inputs for 2 actual value double words of counters 1 and 2
- 2 bytes digital outputs for control bytes of counters 1 and 2
- 8 words analog outputs for 4 start/end value double words of counters 1 and 2
Caution
The high-speed counters of the digital S500 I/O devices are only available when connected to the I/O bus of the AC500 CPUs. If connected to the CS31 bus (e. g. with DC551-CS31 or CI590-CS31-HA) or another fieldbus (with DC505-FBP), no fast counters are available.
The Function Block CNT_IO_EXT has an integrated visualization visuCNT_IO_EXT that can be used to control all Function Block functions in parallel to the user program, if input EN_VISU = TRUE.