Simoco EMEA Ltd SB2K5354O2O2V Manual De Usuario
SGD-SB2025NT-TUM, Part 1
Jan 12
Page 27
GENERAL DESCRIPTION
4.2 E
NVIRONMENT
I/O
O
VERVIEW
The Environment I/O interface module in Solar provides a facility to monitor and control external
devices in a simple “ON/OFF” or “Active/Inactive” state. This information is conveyed via the data
packet protocol such that a change in input status and output change command will be notified,
typically within 1 second.
devices in a simple “ON/OFF” or “Active/Inactive” state. This information is conveyed via the data
packet protocol such that a change in input status and output change command will be notified,
typically within 1 second.
There are sixteen connection points; each point can be designated as an input or an output to suit
the needs of the equipment environment. The input conditions are signalled back to the TM for
display or notification, which is also the point of operation of the control outputs. Monitoring of
inputs and operation of outputs may also be conducted locally.
the needs of the equipment environment. The input conditions are signalled back to the TM for
display or notification, which is also the point of operation of the control outputs. Monitoring of
inputs and operation of outputs may also be conducted locally.
Their purpose may be a mixture of anything the user finds useful – e.g. radio base station alarms,
monitoring the building state, control equipment switching, etc.
monitoring the building state, control equipment switching, etc.
4.2.1
Inputs and Outputs
The I/Os are in binary form, i.e. On/Off, High/Low etc. Setting the “polarity” of the inputs (monitor
points) is important if they are to be used as Alarm triggers. Each port can be “named” to assist in
identification of the function connected to it; these names are entered into the unit via the ET. The
names are passed down to the TM as part of the Supervision Data link.
points) is important if they are to be used as Alarm triggers. Each port can be “named” to assist in
identification of the function connected to it; these names are entered into the unit via the ET. The
names are passed down to the TM as part of the Supervision Data link.
Connection to these I/O ports is not intended to be ‘universal’ and, therefore, requires some
thought in order to achieve the required functionality. Particularly, the external wiring of the Inputs
(Monitor Points) needs to be addressed with some care both from the electrical as well as the
functional point of view.
thought in order to achieve the required functionality. Particularly, the external wiring of the Inputs
(Monitor Points) needs to be addressed with some care both from the electrical as well as the
functional point of view.
Bear in mind the effect on the function if the plug connecting the Environment is disconnected. If
the function has been wired to be open circuit in its normal state and closed circuit to show an
alarm or error, then, with the connector removed, the alarm state can never be detected. Perhaps
it would be an advantage to wire the other way round, then an alarm is detected – even if it is only
to show the connector has been removed.
the function has been wired to be open circuit in its normal state and closed circuit to show an
alarm or error, then, with the connector removed, the alarm state can never be detected. Perhaps
it would be an advantage to wire the other way round, then an alarm is detected – even if it is only
to show the connector has been removed.
4.2.2
Input ‘Polarity’
In order to assist with the detection of an “error” state or at least to get the status indicators to work
in a logical sense, a method of inverting the “polarity” of the sense is provided via the ET. If a
spare input is available, it may be useful to link this to ground within the mating connector and,
therefore, reflect the state of the connector being present or not.
in a logical sense, a method of inverting the “polarity” of the sense is provided via the ET. If a
spare input is available, it may be useful to link this to ground within the mating connector and,
therefore, reflect the state of the connector being present or not.
4.2.3
Output ‘Polarity’
The “CONDITION ON” state for each input may be defined as input low or input high as
appropriate on an individual input basis. Similarly, the “ON” state for each output may be defined
as “Button IN” or “Button OUT” on an individual output by output basis to suit the required purpose.
appropriate on an individual input basis. Similarly, the “ON” state for each output may be defined
as “Button IN” or “Button OUT” on an individual output by output basis to suit the required purpose.
4.2.4
Electrical Constraints
The source of an input signal may be in the form of dry switch contacts, open collector, or ‘Hi/Lo’
voltages where a “Hi” voltage is ≥1.3 V and <50 V, and a “Lo” voltage is ≤1.0 V. An open circuit
will ‘float’ up to approximately 3 V as a 3.3 kΩ pull-up resistor is used and, therefore, an external
input must present less than a 2 kΩ resistance to be registered as a low state.
voltages where a “Hi” voltage is ≥1.3 V and <50 V, and a “Lo” voltage is ≤1.0 V. An open circuit
will ‘float’ up to approximately 3 V as a 3.3 kΩ pull-up resistor is used and, therefore, an external
input must present less than a 2 kΩ resistance to be registered as a low state.
The outputs are high current open-collector Darlington arrays and can be used on loads supplied
externally to a maximum voltage of 50 V and switch a maximum current of 350 mA. At this current,
the ‘ON’ output voltage will be approximately 1 V.
externally to a maximum voltage of 50 V and switch a maximum current of 350 mA. At this current,
the ‘ON’ output voltage will be approximately 1 V.