A. Technical appendix
Festo GDCC-CECX-K-D1-EN en 0802a
77
AC and DC supply
Property
Description
Switch-on peak current
Approx. 10 A
Designation of the external terminals for power
supply connections
0 V/+24 V
Specification of particular requirements for the
power supply installation
−
when using several power supplies to supply
the PLC system
−
when there are deviations in value or frequency
from the supply voltage
No electrical isolation, ground internally connected.
Fuse protection with max. 10 A (cable protection)
Nominal voltage: 24 V
Supply voltage: 19.2 … 30 V
Consequences if supply is incorrectly connected as
follows:
−
Polarity switched
−
Incorrect voltage values and/or frequency
−
Incorrect pin allocation
Safety mechanisms:
Polarity protection (diode) for power supply unit,
surge protection is integrated (+/-35 V) as maximum
rating U
IN
= +/-35 V.
No electrical isolation of the power supply unit
Specifications about the reaction of the PLC sys-
tem to typical consequences of disconnection and
reconnection of the supply
10 ms voltage bridging for drops with no conse-
quences. A REBOOT is performed if the voltage supply
is disconnected for more than 10 ms.
Specifications for determining the maximum inter-
ruption times that will not influence normal opera-
tion of a PLC system configuration.
Severity level (PS-1 or PS-2) for equipment sup-
plied by direct current
Bridging is performed for 10 ms (at 24 V) under all
load conditions, longer with partial load.
Memory buffering time
3 years for battery-buffered SRAM
(after that the battery needs to be replaced)
Recommended time interval for replacement of
power supplies and subsequent effect on the PLC
system
Battery replacement required after 3 years.
SRAM data is lost during replacement of the battery.
Switch-on peak value of the input current (cold
and warm start) or recommended fuse size and
trip characteristics
Depending on the system composition, inrush current
restricted to 10 A through internal circuitry. 24 V DC
main supply with 6.3 A fuse (slow-blow)
Table A.9 AC and DC supply
A.2.2
Digital inputs (current-consuming)
Property
Description
Voltage curve across the entire operating range
Within the tolerances defined in DIN EN 61131
Time delay for transitions 0 -> 1 and 1 -> 0
Configurable
Existence of common potentials between the
channels
Reference potential: common GND for all digital inputs
