Rev 20.11.2019
V1.07 - Page 15
Subject to modifications!
romutec Steuer.-und Regelsysteme GmbH Jochsberger Straße 39 D-91592 Buch am Wald
www.romutec.de
Subject to technical changes
5.4 Digital input/output module with relay outputs 4 DIO-R eco
The module
romod 4 DIO-R eco
provides four
digital inputs and four digital outputs. It is used to
control four 1-stage motors, or other digital
actuators, and for signaling of up to four digital
messages. These include operating messages,
error messages such as frost, filter dirty or fan
belt damaged, and status messages.
Digital outputs:
The DOs of the
romod 4 DIO-R eco
are
controlled via MODBus commands.
The relay outputs provide the normally open
contact of each relay. They will be contacted via
terminals.
Important:
The signals to be switched must
have the same phasing.
By means of configuration registers there can be
defined that the digital outputs will also follow the
signals of the digital inputs (in addition to the
control via MODBus). Both, static control and
toggling are possible. Moreover, on and off
delays can be set for each output, as well as
minimum times for the states ON and OFF.
Mutual interlocking of outputs is also possible.
All digital outputs can be configured so that they will assume a defined state (‘safe state’) if the module has
not received valid bus telegrams via the MODBus for a certain time. These predefined states are set
separately for each output, whereas the time until activating the safe state is common for all outputs of a
module.
Note: The time for triggering the 'safe state' should not be too short in order to avoid malfunctions
as they can occur, e.g., when another device which is connected to the bus fails and will so cause
time-outs.
Digital inputs:
The control of the digital inputs will be done with 24 V switched by external dry contacts that are connected
to the module via terminals.
The reference potential is defined via the COM terminals and can be both, 0 volts and 24 volts, i.e. that
reference potential for the inputs has to be connected anyway. When using a reference potential of +24
volts, a control of the digital inputs with 0 V potential can be realized.
Using the settings in MODBus registers, you can select open circuit or closed-circuit principle for each input
separately.
