02-00002-01-en, July 2007
1(4)
TAC Xenta
®
421A/422A
Universal Input and
Digital Output Module
Configuration Instruction
02-00002-01-en
Physical Inputs and Outputs
TAC Xenta 421A/422A can be used as a normal Xenta I/O
module or as a certified L
ON
M
ARK
® 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:
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
state=0 or >1: Off
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.
LONMARK CONFIGURATION AND VARIABLES
(continued ...)
Bit 0
Bit 15
