7
Electrical installation
Safe digital outputs (F-DO.)
Manual – MOVISAFE
®
CS..A Safety Card (Version 2)
61
Note the dependency of the achieved Performance Level (PL) and SIL on the selected
connection variant of the safe digital outputs. For each of the two outputs F-DO00 and
F-DO01, a maximum switching frequency of 10 Hz is possible with a processing cycle
of less than one minute. In continuous duty, a maximum switching frequency of 0.5 Hz
is possible. If a fault is detected by diagnostics, the "Output error" error response oc-
curs, which blocks all outputs. The consequence of this is that the respective digital
output is switched to the safe state "open".
Diagnostics can be activated optionally for the 24 V switch outputs F-DO00 and F-
DO01. Diagnostics safely detects a wire break in the interrupted output current circuit.
If a wire break is detected, the "Output error" error response occurs, which blocks all
outputs.
7.6.2
Capacitive loads
•
A capacitive load of no more than 10 nF may be connected to the output without
any additional measures. Capacitive loads often occur in electronic assemblies as
buffer capacitors.
If the capacitive load has a diode in series to its input, the maximum load capacity
permitted is 12 µF. This diode is often installed as polarity protection diode in elec-
tronic assemblies.
•
If the capacitive load is not known or is higher than 10 nF, the inrush current must
be limited to the permitted values of the output pursuant to DIN EN 61131-2.
INFORMATION
Due to the thermal load of the output components, the maximum switching frequency
of the digital outputs in the presence of capacitive loads must be limited to the value
specified in chapter "Technical data" > "Safe digital outputs".
7.6.3
Inductive loads
Inductive loads are, for example, relays, contactors, valves.
•
Inductive loads always must be connected between sourcing and sinking outputs.
•
The energy stored in the load inductance, which depends on the inductance value
and the current, may not exceed the values specified in chapter "Technical data".
NOTICE
Operation of inductive loads without freewheeling diode may damage the
MOVISAFE
®
CS..A safety card.
Damage to the MOVISAFE
®
CS..A safety card
•
Inductive loads must always be connected via a freewheeling diode. The safe di-
gital outputs of the MOVISAFE
®
CS..A safety card are not equipped with a free-
wheeling diode.
•
Varistors and other overvoltage protection elements are not permitted.
7.6.4
Ohmic loads
Lamps are examples of ohmic loads.
•
Lamps can be connected for display purposes. Note that an increased cold current
flows when incandescent lamps or halogen lamps are switched on. The cold cur-
rent must not exceed the permitted output current pursuant to DIN EN 61131-2.
28482271/EN – 03/2019