LENZE E94ASHE2454 E94ASHE2454 E94ASHE2454 E94ASHE2454 E94ASHE2454 E94ASHE2454

outputs these alarms via a PG/PC, HMI device, the Web server or the integrated
display. System diagnostics is also available when the CPU is in STOP mode.Know-how protection
The know-how protection protects user blocks against unauthorized access and
modifications.
– Access protection
Extended access protection provides high-quality protection against unauthorized
configuration changes. You can use authorization levels to assign separate rights to
different user groups.
– Integrity protection
The system protects the data transferred to the CPU against manulation. The CPU
detects incorrect or manulated engineering data.
● Additional supported functions:
– PROFIenergy
For information on "PROFIenergy", refer to the PROFINET The analog on-board I/O has the following technical properties:
● Analog inputs
– 5 analog inputs
– Resolution 16 bits including sign
– Voltage measurement type can be set individually for channel 0 to 3
– Current measurement type can be set individually for channel 0 to 3
– Resistor measurement type can be set for channel 4
– Thermal resistor measurement type can be set for channel 4
– Configurable diagnostics (per channel)
– Hardware interrupt on limit violation can be set per channel (two low and two high
limits in each case)
– Support of the value status (Quality Information, QI)
● Analog outputs
– 2 analog outputs
– Resolution: 16 bits incl. sign
– Voltage output selectable by channel
– Current output selectable by channel
– Configurable diagnostics (per channel)
– Support of the value status (Quality Information, QI)
The analog on-board I/O supports the following functions:
● Reconfiguration in RUN
(for more information, refer to the section Parameter assignment and structure of the
parameter data records of the analog on-board I/O (Page 148))The digital on-board I/O has the following technical properties:
● Digital inputs
– 16 high-speed digital inputs for signals up to max. 100 kHz
The inputs can be used as standard inputs and as inputs for technology functions.
– Rated input voltage 24 V DC
– Suitable for switches and 2-/3-/4-wire proximity switches

Configurable diagnostics
– Hardware interrupt can be set (for each channel)
– Support of the value status (Quality Information, QI)
● Digital outputs
– 16 digital outputs, 8 of which can be used as high-speed outputs for technology
functions
The outputs can be used as standard outputs and as outputs for technology functions.
– Rated output voltage 24 V DC
– Rated output current
- as output for standard mode 0.5 A per channel
- as output for technology functions, you can select between an output current of up to
0.5 A for an output frequency up to 10 kHz (load-dependent) and a reduced output
current of max. 0.1 A at an increased output frequency of up to 100 kHz
– Suitable, for example, for solenoid valves, DC contactors and indicator lights as well
as for signal transmission or proportional valves
– Configurable diagnostics
– Support of the value status (Quality Information, QI)
You can find a table showing the output frequencies and output currents through which
outputs is available in the section Interconnection overview of the outputs (Page 99).
The digital outputs feature driver blocks with push-pull outputs. Due to their basic
functional design, such driver blocks always contain parasitic diodes, that act as
freewheeling diodes when shutting off inductive loads (see figure "Current flow with
correct wiring using the digital on-board I/O X11 as an example" in the section Wiring and
block diagrams of the digital on-board I/O (Page 82)). The shutdown voltage is limited to -
0.8 V. Therefore, the demagnetization of inductive loads takes longer and can be
approximately calculated using the following formula.
tau = L / R (tau= time constant, L = inductance value, R = ohmic resistance value)
After the expiration of a period of 5 * tau, the current has decreased in effect to 0 A due to
the inductive load.
The maximum value is derived from: tau = 1.15H / 48 Ohm = 24ms. After
5 * 24 ms = 120 ms, the current has decreased in effect to 0 A.
For comparison: With standard modules, inductive shutdown voltage, for example, is
limited to Vcc -53 V (supply voltage – 53 V), so that the current has decreased to about to
0 A after 15 ms.