Product overview
2.3 Properties
CPU 1512C-1 PN (6ES7512-1CK00-0AB0)
30 Manual, 09/2016, A5E35306440-AB
The digital on-board I/O has the following technical properties:
● Digital inputs
– 32 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
– 32 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, e.g., solenoid valves, DC contactors and indicator lights or also for signal
transmission or for 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 outputs (Page 100).
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 Terminal
and block diagram of the digital on-board I/O (Page 81)). 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= 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.
The digital on-board I/O supports the following functions:
● Reconfiguration in RUN
You can reconfigure some of the technological functions in the RUN mode of the CPU
(for more information, refer to the section Parameter assignment and structure of the
parameter data records of the digital on-board I/O (Page 158)).
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