Additional Resources; Communication Channels; Inputs, Outputs, Internal Variables, Counters, Analog Inputs - LOVATO ELECTRIC DCRG8 Manual Operativo

ADDITIONAL RESOURCES

– The expansion modules provide additional resources that can be used through the dedicated setup menus.
– The setup menus related to the expansions are always accessible, even if the expansion modules are not physically fitted.
– Since it is possible to add more than one module of the same type (for instance two communication interfaces), the setup menus are multiple, identified by a
sequential number.
– The following table indicates how many modules of each group can be mounted at the same time. The total number of modules must be less than or equal
to 4.
MODULE TYPE CODE
ADDITIONAL STEPS EXP 10 06
EXP 10 01
COMMUNICATION EXP 10 10
EXP 10 11
EXP 10 12
EXP 10 13
EXP 10 14
EXP10 15
DIGITAL I/O EXP 10 00
EXP 10 02
EXP 10 03
ANALOG I/O EXP 10 04
EXP 10 05
EXP 10 16
TBD = To Be Defined.

COMMUNICATION CHANNELS

– The DCRG8 supports a maximum of 2 communication modules, indicated as COMn. The communication setup menu is thus divided into two sections
(n=1 ... 2) of parameters for the setting of the ports.
– The communication channels are completely independent, both for hardware (physical interface) and communication protocol.
– The two channels can communicate at the same time.
– Activating the Gateway function, it is possible to use a DCRG8 with an Ethernet port and a RS485 port that acts as a bridge for other DCRGs equipped with
RS485 only, in order to obtain a more economical configuration with one Ethernet port only.
– In this network, the DCRG with Ethernet port will have parameter P16.n.09 Channel function set to Gateway for both communication channels (COM1, COM2)
while the other DCRGs maintain standard configuration with default value = Slave.

INPUTS, OUTPUTS, INTERNAL VARIABLES, COUNTERS, ANALOG INPUTS

– The inputs and outputs are identified by a code and a sequence number. For instance, the digital inputs are identified by code INPx, where x is the number of
the input. In the same way, digital outputs are identified by code OUTx.
– The sequence number of I/Os is simply based on their mounting position, with a progressive numbering from left to right.
– It is possible to manage up to 8 analog inputs (AINx), connected to external analog sensors (temperature, pressure, flow, etc.). The value read by the sensors
can be scaled to any unit of measure, viewed on the display and transmitted on the communication bus. The values read by analog inputs are shown on the
dedicated display page. They can be used to drive limit thresholds LIMx that can be linked to an internal or external output.
– The expansion I/O numbering starts from the last I/O installed on the base unit. For example, with OUT1...OUT8 digital outputs on the base unit, the first
digital output on the expansion modules will be OUT9.
See the following table for the I/O numbering:
CODE DESCRIPTION
INPx Digital Inputs
OUTx Digital Outputs
COMx Communication ports
AINx Analog Inputs
AOUx Analog Outputs
– In a similar way, there are some internal bit-variables (markers) that can be associated to the outputs or combined between them. For instance, it is possible
to apply some limit thresholds to the measurements taken by the system (voltage, current, power, etc.). In this case, the internal variable, named LIMx, will
be activated when the measurements go out of the limits defined by the user through the dedicated setting menu.
– Furthermore, there are up to 8 counters (CNT1..CNT8) that can count pulses coming from an external source (through a digital input INPx) or the number of
times a certain condition has taken place. For instance, defining a limit threshold LIMx as the count source, it will be possible to count how many times one
measurement exceeds a certain limit.
– The following table groups all the I/O and the internal variables managed by the DCRG8 along with their range.
CODE DESCRIPTION
LIMx Limit thresholds
REMx Remote-controlled variables
UAx User alarms
PULx Energy consumption pulses
CNTx Programmable counters
FUNCTION
2 RELAY STEPS
4 STATIC STEPS (FAST)
USB
RS232
RS485
Ethernet
Profibus® DP
GSM-GPRS
4 INPUTS
2 INPUTS + 2 STATIC OUTPUTS
2 RELAYS WITH 1 C/O EACH
2 ANALOG INPUTS
2 ANALOG OUTPUTS
CAPACITOR HARMONIC PROTECTION
BASE
-
1...8
-
-
-
G
B
MAX N° SLOT POS.
4 Any
2 Any
2 1 or 2
2 1 or 2
2 1 or 2
1 1 or 2
1 TBD
1 2
2 1 or 2
4 1 or 2
4 Any
2 1 or 2
2 1 or 2
4 Any
EXP...
1...8
9...16
1...2
1...4
1...4
RANGE
1...16
1...16
1...8
1...3
1...8
7