High-Speed Counter; Chapter 8 Using High-Speed Input Functions - INVT IVC2H Programming Manual

Programming manual of IVC series small PLC

Chapter 8 Using high-speed input functions

This chapter presents the usage and notes about the high-speed input functions, including high-speed counter and external
pulse capture function.

8.1 High-speed counter

8.1.1 Configuration
The built-in high-speed counter for IVC series small PLCs are configured as follows:
Input point
Counter
C236 Up/down
C237
C238
C239
Single
C240
phase
single C241
point C301
input
C302
mode
C242 Up/down
C243
C244 Up/down
C245
C246
Single
C247
phase
C303
up/
down
C248
input
C249
mode
C250
C251
C304
C305
Double
C306
phase
input
C252
mode
C253
C254
C255
SPD instruction
Pulse capture function
External interrupt No.
(rising/falling edge)
In the modes listed in the preceding table, the high-speed counters will act according to certain input and handle high-speed
action according to interrupts. The counting practice is unrelated to the PLC scan cycle.
All the high-speed counters are of the 32-bit up/down type. According to their different up/down switchover methods, they fall
into the following four categories:
Counting method
Single phase single point
input
Table 8-1 High-speed counter configuration
X0 X1 X2
Up/down
Up/down
Up/down
Reset
Up/down
Reset
Up/down
Up Down
Up Down Reset
Up Down Reset
Ph A Ph B
Ph A
Ph A Ph B Reset
Ph A Ph B Reset
Input Input Input
point point point
Input Input Input
point point point
0/10 1/11 2/12
C236~C245 and C301~C302 are down counters when SM236~SM245 and SM301~SM302 are ON, and
up counters when SM236~SM245 and SM301~SM302 are OFF
Chapter 8 Using high-speed input functions
X3 X4 X5
Up/down
Up/down
Up/down
Reset
Reset
Up Down
Up Down Reset
Up Down Reset
Ph B
Ph A Ph B
Ph A Ph B Reset
Ph A Ph B Reset
Input Input Input
point point point
Input Input Input
point point point
3/13 4/14 5/15
Action
Max. frequency(kHz)
X6 X7
IVC2H IVC2L
100
Up/down
Start
Start
100
Start
Start
Ph A Ph B
50
Start
Start
Input Input
100
point point
Input Input
/
point point
6/16 7/17 /
256
IVC1
IVC1
L
50
10
/
10
50
10
/
10
30
/
5
10
/
/