Siemens SIMATIC S7-1200 - Page 1503

Technical specifications
A.13 Digital signal boards (SBs)
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
1503
Technical data
SB 1222 DQ 4 x 24 V DC, 200 kHz
SB 1222 DQ 4 x 5 V DC, 200 kHz
Switching delay 1.5 μs + 300 ns rise
1.5 μs + 300 ns fall
200 ns + 300 ns rise
200 ns + 300 ns fall
Behavior on RUN to STOP Last value or substitute value (default value 0)
Number of outputs on simultaneously
• 2 (no adjacent points) at 60 °C
horizontal or 50 °C vertical
• 4 at 55 °C horizontal or 45 °C verti-
cal
4
Cable length (meters) 50 shielded twisted pair
1
Because both sinking and sourcing configurations are supported by the same circuitry, the active state of a sourcing
load is opposite that of a sinking load. A source output exhibits positive logic (Q bit and LED are ON when the load has
current flow), while a sink output exhibits negative logic (Q bit and LED are OFF when the load has current flow). If the
module is plugged in with no user program, the default for this module is 0 V, which means that a sinking load will be
turned ON.
Note
When switching frequencies above 20
kHz, it is important that the digital inputs receive a
squar
e wave. Consider the following options to improve the signal quality to the inputs:
•
Minimize the cable length
•
Change a driver from a sink only driver to a sinking and sourcing driver
•
Change to a higher quality cable
•
Reduce the circuit/components from 24 V to 5 V
•
Add an external load at the input