Programming manual SCU-series
HB-37500-820-10-12F-EN SCU Programming manual
Page 145 of 252
Status: 19.03.2021
If no resources (memory) for the monitoring program are available in hte SCU module, the
components of the function blocks are no longer shown in the library view.
This is the case if, e. g., all digital connections of an SCU module are occupied, or if all timer
modules have been used.
By deleting the corresponding function blocks, these resources can be released again.
4.13.1. Device modules
4.13.1.1. Master devices
The Master device is the basic module for programming. Compact or modular series of the Master
devices on the basis of the Slave module (extensions) can be used.
For the compact series, only I/O extensions can be configured.
For the modular series, I/O extensions or axle extensions up to the maximum number of Slave
devices permitted by the Master device can be used.
A SafePLC
2
document can contain programmes for several Master different Master devices. The
Master devices with this capatildity can communicate with each other via the SMMC network.
NOTE:
In the modular series, I/O devices can be configured to the maximum number of Slave
devices.
4.13.1.2. Slave devices
A Slave device is an extension module offering more I/O connections or allowing the control of
more axles. There are two types of Slave devices:
I/O extensions enlarge the number of inputs and outputs.
Axle extension modules can be used to monitor additional axes. The axle extension modules also
provide additional inputs and additional outputs.
If the I/O extensions or the axle extensions are connected with their Master via the SDDC network,
they are shown in the document browser of the local I/O or in the local axis folder
4.13.1.3. Peripheral devices
Peripheral devices are external blocks which are connected to the inputs / outputs of the SCU
module, and provide input signals / output signals.
They can be inserted in the terminal scheme or in the circuit diagram, where they are automatically
connected with the corresponding connections of the SCU devices.
After the peripheral devices have been inserted, the corresponding function block is created. (In
the function plan) Together with other function blocks, this function block can be used to configure
the desired function of the system.