IGS-NT-BC, SW Version 1.2.0,
©ComAp – January 2019
IGS-NT-BC-1.2.0 Reference Guide.PDF
35
Values for continuous writing from external sources
This function is especially designed for continuous writing of setpoints from external sources (e.g. via
Modbus connection).
W
ARNING
!
Setpoints must not be written
continuously
(e.g. via Modbus connection)! If continuous change of setpoints
is required, combination of External values and Force value function needs to be used. The memory that
holds setpoints is designed for up to 10
5
writings. Than memory may be damaged!
It is possible to use up to four different External values for continuous writing from external sources. The
values are adjusted by setpoints in
Force value
group. Default (also initial) value may be adjusted, rate of
change of
ExtValueX
(by Binary Inputs E
XT
V
ALUE
X
UP
and E
XT
V
ALUE
X
DOWN
) can be adjusted as well as
high and low limit of the value.
There are two way, how to adjust External values. One is using Binary Inputs mentioned above. Second one
is to write the value directly using e.g. Modbus. External values then may be converted using PLC block
convert and force into setpoint which is then continuously forced (
note: NOT WRITTEN
) by the value of
ExtValueX. This way internal memory is safe and no damage may occur.
External values are reverted back to their default (initial) value (given by corresponding setpoint) when
Binary Input for their reset is active (and they change to the previous value after Binary Input deactivates).
When the Binary Input is active the External value cannot be changed by Modbus writing or by using Binary
Inputs for up and down value.
N
OTE
:
External values are not available for external writing when any Binary Input (up, down or reset) related to
them is active.
Note also that when the controller is reset (powered down and up again), all external values are reverted
back to their default (initial) values.
H
INT
For information on how to write (or read) objects from controller via Modbus, please refer to the latest
Communication guide for InteliGen and InteliSys.
General Purpose Timers
There is 16 general-purpose timers in the controller, each 4 of them are joined together to one output. That
means there are 4 fully independent timer blocks including 4 timer channels each. The combined outputs
from the timer blocks are
T
IMER
A
CT
1-4
,
T
IMER
A
CT
5-8
,
T
IMER
A
CT
9-12
AND
T
IMER
A
CT
13-16
.
The timers are intended for scheduling of any operations such as e.g. periodic tests of the gen-set,
scheduled transfer of the load to the gen-set prior to an expected disconection of the mains etc. Each timer
channel can be activated only once within a single day. The activation time and duration of each channel is
adjustable (both as hh:mm).
