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TAC Xenta® 421A/422A |
02-00002-01-en |
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Universal Input and Digi- |
Configuration Instruction |
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tal Output Module |
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LONMARK CONFIGURATION AND VARIABLES
Physical Inputs and Outputs
TAC Xenta 421A/422A can be used as a normal Xenta I/O module or as a certified LONMARK® device. It has
•4 Universal Inputs (UI)
•5 Digital Outputs (DO)
In addition, TAC Xenta 422A has five manual switches, one for each DO that can be set
•manual Off
•manual On
•Auto
To configure the inputs and outputs, and to specify the transmission of values, either ordinary TAC Menta®/Xenta configuration or nci SNVTs are used. The usage is explained overleaf ("SNVT vs TAC Xenta I/O module Communication".)
The use of SNVTs requires explicit information listed below.
UI Configuration
Each of the four UI:s (1-4) is configured with nciInput1-4 0 = not connected (default value)
1 = 1.8 kohm thermistor
2 = DI, green indication
3 = 0-10 V
4 = 0-20 mA
5 = 10 kohm thermistor
6 = DI, red indication
7 = DI, green inverted indication
8 = DI, red inverted indication
If configured to be a digital input (DI, any type), its function is further determined by the corresponding bit in
nciDigInNONC:
Bit 0 
Bit 15
DI 1
DI 2
DI 3
DI 4
If bit=0: NO, normally open (default value)
If bit=1: NC, normally closed
Pulse counting is not available for SNVT communication.
UI Values
Depending on the UI configuration, each UI n=1-4 generates a valid value in one of these (the other two are set invalid):
nvoAnalog1-4 (0-10 V or 0-20 mA, converted to 0-100%; invalid=163.835)
nvoDigital1-4 (DI, any type)
Off: state=0, value=0
On: state=1, value=100
Invalid: state=255
nvoTemp1-4 (thermistor, any type; invalid=327.67)
UI Value Transmission
The UI value will be transmitted
a)when the change in value is large enough (set individually per UI)
b)at a specified time interval (common for all UIs)
a) is determined by
nciSndDelta1-4 (dimensionless; default value=2)
Size of change to cause transmission Ex.: 1 means
-if configured as analog input: 1%
-if configured as temperature input: 1 °
If the UI is configured as a digital input, a status change will always be transmitted.
b) is determined by
nciSndHrtBt "Heartbeat" interval in seconds (default=60)
A valid and configured UI value will be sent at least once during each interval regardless of change.
The transmissions will be distributed over time to avoid momentary communication overload.
DO Values
The digital output values to the output (DO, n=1-5) are received as:
nviDO1-5 |
switch:state |
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state=0 or >1: Off |
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state=1: On |
For the TAC Xenta 422A, the DO values may be overridden by manual switches. Their status is indicated in
nvoHandBoard1-5 switch:state. state=0: manual Off state=1: manual On
state=255 ('invalid'): Auto
Any DO status change will immediately be transmitted.
DO Values in the Off-line Condition
The DO values are expected to be updated regularly. However, this may be prevented by communication failure or, temporarily, after power-up.
(continued ...)
02-00002-01-en, Nov 2009 |
(4) |
To determine if all nviDO1-5 are to be considered valid, an interval counter is used:
nciRcvHrtBt No. of seconds until nviDO1-5 are considered invalid. (0: function is not used; default value.)
If this happens, due to communication failure, the behavior is determined by
nciOfflineBeh, using the following bits:
Bit 0 |
Bit 15 |
DO 1 
DO 2
DO 3
DO 4
DO 5
If bit=1: Use default value as specified by
nciOfflineVal, using the following bits, where the value to be used is specified (0 or 1). (Default value=0.)
Bit 0 |
Bit 15 |
DO 1
DO 2
DO 3
DO 4
DO 5
If bit=0: Keep latest value (default).
SNVT vs TAC XENTA I/O MODULE COMMUNICATION
The TAC Xenta 421A/422A can be used in networks with either LONMARK communication or TAC Xenta I/O module communication. The device automatically determines which type of communication to use.
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Green |
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Power-up |
off-line |
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blink |
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SNVT |
TAC Xenta I/O module |
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communication |
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received |
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established |
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Green blink |
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TAC Xenta |
I/O on-line: |
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SNVT |
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I/O module |
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at comm. |
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green 0.5 Hz |
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TAC Xenta |
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or 0.1 Hz |
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communication |
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I/O module comm. established
In the Power-up state, the green LED blinks "Off-line". The
State diagram
device is open for both SNVT and TAC Xenta I/O module communication.
Previous configuration, if defined, will apply until a change is initiated.
SNVT received
Once in the TAC Xenta I/O module communication state, the device can only enter the SNVT state after a new Power-up. At this stage all nci:s must be updated, since the same memory area is used by both the SNVT and TAC Xenta I/O module communication configuration parameters.
Note! As the TAC Xenta I/O module communication state is a 'dead-end' (until power-up), any mis-addressed communication may cause the I/O module to loose its SNVT communication state.
TAC Xenta I/O module communication is inititiated by the controller at events specified below. If an I/O module intended for SNVT communication has been used in another configuration and happens to have an address that is used by the I/O module communication, the I/O module will be 'lost' in this state.
TAC Xenta I/O module communications will be initiated by the following events:
•Controller power-up
•I/O module power-up
•Controller application download
•Recovery after communication failure
The device enters the SNVT state. The device is configured |
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when the nci:s are updated. The green LED will light up when |
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Service pin |
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there is communication or approximately every 10 seconds. |
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SNVT transmission is determined by the nciSndDelta1-4 or |
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the nciSndHrtBt values. |
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The device remains in the SNVT state until a TAC Xenta I/O |
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module communication state is established, or until the next |
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Red LED (Configuration error) |
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power-up. In the SNVT state it is possible to change the con- |
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- blinking: unconfigured node |
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figuration by updating the network configuration inputs nci:s. |
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- steady: appl.less (or hw fault) |
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TAC Xenta I/O module Communication |
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The TAC Xenta I/O module communication state is accepted |
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only after a thorough protocol initiation. This may be initiated |
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at any time. |
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In the TAC Xenta I/O module communication state, no nvi:s |
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or nci:s can be used. The green LED blinks on-line at about |
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Green LED (Communication) |
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0.5 Hz. |
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- SNVT: at communication or ~ once in 10 sec.s |
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Input SNVTs are ignored, also when the device is off-line from |
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- TAC Xenta I/O mod communication: |
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the controller. |
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on-line ~ every other sec; off-line ~ 5 blinks per sec |
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However, output SNVT transmission is still performed using a |
LED indicators on front panel |
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hard-coded interval of about 10 seconds. |
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(4) |
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02-00002-01-en, Nov 2009 |
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