5.3 Single Phase Speed Counter
When the count input is changed from OFF to ON, the count value is increased by 1. When the count value reaches the set value, the count value is reset to 0, and I/O interrupt program is activated (if the interrupt enable flag is ON). The count value is reset to 0 when the reset input comes ON. This counter operation is enabled while the
Hardware Condition:
Count input (IP 1 and IP 2) (X000 and X001)
ON/OFF pulse width: 10 micro or more (max. 50 kHz)
Reset input (X002 and X003)
ON/OFF duration: 2 ms or more
Related Registers:
Function | Register/device | Remarks | |
|
|
|
|
| Channel 1 | Channel 2 |
|
|
|
|
|
Count input | IP 1 (X000) | IP 2 (X001) |
|
|
|
|
|
Reset input | IP 3 (X002) | IP 4 (X003) |
|
Set value | MW12 SW13 | MW14 MW15 | Data range: H0000 0000 to HFFFF FFFF |
|
|
|
|
Count value | MW16 MW17 | MW18 MW19 |
|
|
|
|
|
M320 | M328 | Operation is enabled when ON | |
|
|
|
|
Interrupt enable | M322 | M330 | Interrupt is enabled when ON |
|
|
|
|
Count preset | M323 | M331 | Used to preset the counter value |
|
|
|
|
Note1:
When both the channels are configured in high speed mode, IP1 to IP4 cannot be used as normal input devices. However, if either one channel is configured in high speed mode, the inputs for other channel can be used as normal input devices.
Note2:
Two words are used for storing the double word (32bit) count/set values. Lower word will contain Lower 16bit value and Higher word will contain higher 16 bit. This register storage scheme is applicable for all the modes.
value. Eg. Count value : MW16,MW17 So if count value is (Hex) 87654321
MW16 = 4321 (Hex)
MW17= 8765 (Hex)
Note3:
Input 3 and input 4 are used as reset inputs for count inputs 1 and 2. So do not use input 3 and 4 as normal inputs when PLC is configured in this mode.
Interrupt assignment
Channel 1
Channel 2
Page 90
