Siemens Sinamics S110 Function Manual page 336

Safety Integrated Functions
8.6 Controlling the safety functions
● Dimensioning of load resistors - example 1:
● Dimensioning of load resistors - example 2:
The following terminals can be used to connect the external resistors, for example:
● Phoenix Contact
● • WAGO:
Overview of important parameters (see SINAMICS S110 List Manual)
● r0722 CO/BO: CU digital inputs, status
● p10002 SI discrepancy monitoring time
● p10140 SI F-DI input mode
336
According to manufacturer documentation, the leakage current of an F-DO on a safety
PLC is 1 mA; in other words, it is around 0.5 mA higher than is permissible for the F-DI.
The necessary load resistance is therefore R = 5 V/0.5 mA = 10 kΩ.
At maximum supply voltage, the power loss for this resistor is:
P = (28.8 V) /R = 83 mW. The resistor is to be permanently dimensioned for this power
2
loss.
If further conditions for the digital output (e.g. a minimum load or a maximum load
resistance) are specified in the manufacturer documentation, these must be taken into
account.
For example, a minimum load of 1 kΩ is specified for the SIMATIC ET200S 4 F-DO I/O
module (6ES7 138-4FB02-0AB0).
Therefore, two additional 1 kΩ load resistors and a continuous load capacity of at least P
= (28.8 V) /R = 830 mW are required to connect an F-DO of this kind to a CU305 F-DI.
2
– P-CO component connector
- part number: 3036796
– Three-wire terminal with quick-acting locking technique QTC 1.5-TWIN-TG, part
number: 3050413
Alternative to this terminal:
– Universal terminal with screw connection UT 4-TWIN-TG
- part number: 3046595
– Universal terminal UDK 4-DUR
- part number: 2775207
– Empty component plug housing
- part number: 280-801
– 4-conductor base terminal, center marking, for TS 35, front wiring, CAGE CLAMP®
terminal, horizontal design
Function Manual, 10/2008, 6SL3097-4AB10-0BP0
Drive functions