Siemens S7-1200 - Page 941

Technical specifications
A.11 Digital signal boards (SBs)
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
941
Table A- 197 Digital outputs
Technical data
SB 1223 DI 2 x 24 VDC /
DQ 2 x 24 VDC, 200 kHz
SB 1223 DI 2 x 5 VDC /
DQ 2 x 5 VDC, 200 kHz
Number of outputs 2 2
Output type
Solid state - MOSFET sink and source
1
Solid state - MOSFET sink and source
1
Voltage range
20.4 to 28.8 VDC
4.25 to 6.0 VDC
Rated value
24 VDC
5 VDC
Logic 1 signal at max. current
L+ minus 1.5 V
L+ minus 0.7 V
Logic 0 signal at max. current
1.0 VDC, max.
0.2 VDC, max.
Current (max.)
0.1 A
0.1 A
Lamp load
--
--
On state contact resistance
11 Ω max.
7 Ω max.
Off state resistance
6 Ω max.
0.2 Ω max.
Leakage current per point
--
--
Pulse Train Output rate
200 kHz max., 2 Hz min.
200 kHz max., 2 Hz min.
Surge current
0.11 A
0.11 A
Overload protection
No
No
Isolation (field side to logic)
500 VAC for 1 minute
500 VAC for 1 minute
Isolation groups
1 (no isolation to inputs)
1 (no isolation to inputs)
Currents per common
0.2 A
0.2 A
Inductive clamp voltage
None
None
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
(default value 0)
Last value or substitute
(default value 0)
Number of outputs on simultaneously
2
2
Cable length (meters)
50 shielded twisted pair
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 switchi
ng frequencies above 20 kHz, it is important that the digital inputs receive a
square 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