TAC Xenta 421A Quick guide

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 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 :
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

2(4) 02-00002-01-en, July 2007
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.
Power-up
SNVT
TAC Xenta
I/O module
communication
Green
off-line
blink
Green blink
at comm.
or 0.1 Hz
I/O on-line:
green 0.5 Hz
SNVT
received
TAC Xenta I/O module
communication
established
TAC Xenta
I/O module
comm.
established
In the Power-up state, the green LED blinks "Off-line". The
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
The device enters the SNVT state. The device is configured
when the
nci :s are updated. The green LED will light up when
there is communication or approximately every 10 seconds.
SNVT transmission is determined by the nciSndDelta1-4 or
the nciSndHrtBt values.
The device remains in the SNVT state until a TAC Xenta I/O
module communication state is established, or until the next
power-up. In the SNVT state it is possible to change the
configuration by updating the network configuration inputs
nci :s.
TAC Xenta I/O module Communication
The TAC Xenta I/O module communication state is accepted
only after a thorough protocol initiation. This may be initiated
at any time.
In the TAC Xenta I/O module communication state, no
nvi :s or
nci :s can be used. The green LED blinks on-line at about 0.5 Hz.
Input SNVTs are ignored, also when the device is off-line from
the controller.
Green LED (Communication)
- SNVT: at communication or ~ once in 10 sec.s
- TAC Xenta I/O mod communication:
on-line ~ every other sec; off-line ~ 5 blinks per sec
Red LED (Configuration error)
- blinking: unconfigured node
- steady: appl.less (or hw fault)
LED indicators on front panel
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:
DO 1
DO 2
DO 3
DO 4
DO 5
However, output SNVT transmission is still performed using a
hard-coded interval of about 10 seconds.
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 communi-
cation may cause the I/O module to loose its SNVT communi-
cation 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
If bit=0: Keep latest value (default).
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.)
DO 1
DO 2
DO 3
DO 4
DO 5
Service pin
Bit 0 Bit 15
Bit 0 Bit 15
State diagram

02-00002-01-en, July 2007 3(4)
Universal Input
Object Type: #0520
Manufacturer Network Variables
Mandatory Network Variables
Configuration Properties
nvoTemp4
SNVT_temp_p
nv2
nvoDigital4
SNVT_switc
nv1
nciInput4 SNVT_count
nvoAnalog4
SNVT_lev_percent
nv1
nciSndDelta4 SNVT_multiplier
Universal Input
Object Type: #0520
Manufacturer Network Variables
Mandatory Network Variables
Configuration Properties
nvoTemp4
SNVT_temp_p
nv2
nvoDigital4
SNVT_switc
nv1
nciInput4 SNVT_count
nvoAnalog4
SNVT_lev_percent
nv1
nciSndDelta4 SNVT_multiplier
○○○○○○○○○○○○○○○○○
Objects 1–4
0560 4-channel configurable I/O
Node Object
Object Type: #0
Configuration Properties
Mandatory Network Variables
nciDigInNONC SNVT_state
nviRequest
SNVT_obj_request
nv1 nvoStatus
SNVT_obj_status
nv2
Universal Input
Object Type: #0520
Manufacturer Network Variables
Mandatory Network Variables
Configuration Properties
nvoAnalog1
SNVT_lev_percent
nv1
nvoTemp1
SNVT_temp_p
nv2
nvoDigital1
SNVT_switc
nv1
nciInput1 SNVT_count
nciSndDelta1 SNVT_multiplier
LONMARK OBJECTS AND NETWORK VARIABLES

4(4) 02-00002-01-en, July 2007
TAC Vista®, TAC Menta®, TAC Xenta®and Talking Buildings®are registered trademarks of TAC AB. LON®, LonMark®and LonWorks®are registered trademarks of the Echelon Corporation.
tac.com
4 0 Dig Outs
Object Type: #20543
Manufacturer Network Variables
Mandatory Network Variables
Configuration Properties
nviDO4
SNVT_switc
nv4
nviDO3
SNVT_switc
nv3
nviDO2
SNVT_switc
nv2
nviDO1
SNVT_switc
nv1
nviDO5
SNVT_switc
nv5
nvoHandBoard4
SNVT_switc
nv9
nvoHandBoard3
SNVT_switc
nv8
nvoHandBoard2
SNVT_switc
nv7
nvoHandBoard1
SNVT_switc
nv6
nvoHandBoard5
SNVT_switc
nv10
nciSndHrtBt SNVT_time_sec
nciRcvHrtBt SNVT_time_sec
nciOfflineBe SNVT_state
nciOfflineVal SNVT_state