Rev 20.11.2019
V1.07 - Page 16
Subject to modifications!
romutec Steuer.-und Regelsysteme GmbH Jochsberger Straße 39 D-91592 Buch am Wald
www.romutec.de
Subject to technical changes
The digital inputs can be used as counters, but only for DC signals. For each input, a prescaler may be
adjusted in order to count, e.g., just every second or third pulse. A subsequent change of the prescaler also
results in a (retroactive) amendment of the corresponding counter values. The pulse duration must be at
least 10 ms to be reliably detected.
For AC control of the inputs, the edge detection has to be delayed via configuration registers (see registers
R1101 and R1111). In case of 50 Hz, this value should be set to at least 40 ms in order to avoid the
counting of false detections. The maximum counter value when using a prescaler of 1 is 65,535 (which is
equivalent to 2
16
-1).
There is a register that displays whether and which DI has changed since the last time this register has
been read. When reading this register, all bits are reset to zero automatically. If a DI's status has altered
several times, e.g. from 0 to 1 and back to 0, a change will be signalized, anyway.
Regarding the system configuration (addressing, max. number of modules connected to a MODBus
Master, installation, connection to the bus etc.), please follow the instructions in the chapter
Configuration
.
Important technical data:
Power supply:
24 V AC or DC, connection via terminals
Current consumption:
typically 68 mA (DC), 152 mA (AC) with all relay outputs activated
Specifications digital outputs:
Relay outputs (NO contact), max. 250 VAC)
Characteristics (Resistive Load):
Initial contact resistance
100m
Ω (at 1A / 24 VDC)
Rated load
3 A at 250 VAC / 30 VDC
Max. switching voltage
277 VAC, 30 VDC
Max. switching capacity
830 VA (AC), 90 W (DC)
Endurance
1x10
5
ops (Rated Load)
Inductive loads
should be avoided as far as possible, or be suppressed at the source,
respectively
Overview terminal assignment:
romod 4 DIO-R eco
G
ND
2
4
V
AC/
DC
C
OM
D
I
1…4
DO No. 1-4
Terminal:
10 11 12 13 14 15 16 17
DI No. 1-4 and COM
Terminal:
23
24
25
26
27
Power supply
Terminal:
1
2
Important:
The signals to be switched must have the same phasing.
Bus connection
Terminal No.
I-GND
3
Net A (
–) aka /D
4
Net B (+) aka D
5
DO 1 DO 2
DO 3
DO 4
