Siemens SIMATIC S7-1200

Programming made easy
6.6 High-speed counter (HSC)
Easy Book
120 Manual, 03/2014, A5E02486774-AF
HSC input channel selection
Use the following table and ensure that the CPU and SB input channels that you connect
can support the maximum pulse rates in your process signals.
Note
CPU and SB input channels (V4 or later firmware) have configurable input filter times
Earlier firmware versions had fixed HSC input channels and fixed filter times that could not
be changed.
V4 or later versions allow you to assign input channels and filter times. The default input filter
setting of 6.4 ms may b
e too slow for your process signals. The filter times for the HSC
inputs must be optimized for your HSC application.
See "Configuring digital input filter times"
for details.
Table 6- 28 CPU input: maximum frequency
CPU
CPU Input channel
1 or 2 phase mode
A/B Quadrature phase
mode
1211C
Ia.0 to Ia.5
100 kHz
80 kHz
1212C
Ia.0 to Ia.5
100 kHz
80 kHz
Ia.6, Ia.7
30 kHz
20 kHz
1214C and 1215C
Ia.0 to Ia.5
100kHz
80kHz
Ia.6 to Ib.5
30 kHz
20 kHz
1217C
Ia.0 to Ia.5
100 kHz
80 kHz
Ia.6 to Ib.1
30 kHz
20 kHz
Ib.2 to Ib.5
(.2+, .2- to .5+, .5-)
1 MHz 1 MHz
Table 6- 29 SB signal board input: maximum frequency (optional board)
SB signal board
SB input channel
1 or 2 phase mode
A/B Quadrature phase
mode
SB 1221, 200 kHz
Ie.0 to Ie.3
200kHz
160 kHz
SB 1223, 200 kHz
Ie.0, Ie.1
200kHz
160 kHz
SB 1223
Ie.0, Ie.1
30 kHz
20 kHz