Did_ - Digital Input Lev_Discrete - Siemens Moore 353 User Manual

UM353-1

3.2.31 DID_ - Digital Input lev_Discrete

DID_ function blocks convert 16 on/off signals received from
a single or multiple nodes on the LonWorks network into 16
block outputs for use by other function blocks within the
controller. A maximum of 6 DID blocks can be used, up to the
limit of nodes allowed on the Lon network or the memory
limit of the controller. Each use of the block will be assigned a
unique station wide ID (e.g. DID02). Input connections are
established by 'binding' each output variable of type
SNVT_lev_disc (SNVT #22) in the remote node devices to
each network variable in the DID function block. These
blocks will be available when the LonWorks option board is
installed in a 352P, 353, or 354N controller.
The 0 NV NUM parameter enables the number that the station
has assigned to input 0. All subsequent network variables are
assigned consecutively.
Each function block output has a mode associated with it. The
mode can be either NORMAL or FORCED. When using a
PC capable of sending LIL or Modbus commands, the mode
can be changed and the forced state can be assigned a high (1)
or low (0) value. The values accessible over the network are
the two switch inputs (N and F) and the position of the SPDT
switch illustrated in the block diagram. A mode of '0' is
Normal and '1' is Forced.
Each function block output also has a quality status associated
with it. This status will go high (1) when the block
determines it has lost communication with the Lon node. If
any of the individual quality outputs are high the Quality
Status block output will also be high.
LonWorks Remote Devices
node r2
nv x1 SNVT_
nv x1 binding
node u, nv *E
nv x2 SNVT_
nv x2 binding
node u, nv *F
X03133S0
March 2003
Station
node r1
nv x1 SNVT_
option board
nv x1 binding
node u, nv *0
Remote
I/O Bus
nv x2 SNVT_
nv x2 binding
node u, nv *1
BLOCK DIAGRAM
DIGITAL INPUT LEV_DISCRETE
DID_
LonWorks
Remote I/O Bus
nviDIDnn_0
nv*
DIGITAL INPUT
SNVT _ lev_disc
0
nviDIDnn_1 LEV_DISCRETE
nv*
SNVT _ lev_disc
1
(16 channel)
nviDIDnn_2
nv*
SNVT _ lev_disc
2
nviDIDnn_3
nv*
SNVT _ lev_disc
3
nviDIDnn_4
nv*
SNVT _ lev_disc
4
nviDIDnn_5
nv*
SNVT _ lev_disc
5
(Channel 0)
nviDIDnn_6
nv*
SNVT _ lev_disc
6
nviDIDnn_7
nv*
SNVT _ lev_disc
7
nviDIDnn_8
nv*
SNVT _ lev_disc
8
nviDIDnn_9 (Channel F)
nv*
SNVT _ lev_disc
9
nviDIDnn_A
nv*
SNVT _ lev_disc
A
nviDIDnn_B
nv*
SNVT _ lev_disc
B
nviDIDnn_C
nv*
SNVT _ lev_disc
C
nviDIDnn_D
nv*
SNVT _ lev_disc
D
nvDIDnn_E
nv*
SNVT _ lev_disc
E
nviDIDnn_F
nv*
SNVT _ lev_disc
F
0 N V N U M
0 N V
etwork ariable
LonWorks
node u
N
nv *0 SNVT_
F
Channel 0
0
F
N
nv *0
SNVT_
F
F
Channel F
F
Quality Test
Function Blocks
Output 0
O0
Quality 0
Q0
Output F
OF
Quality F
QF
Quality Status
QS
NUM
ber (nv *) (R) ....... 1 to 2000 (*)
O0
Q0
OF
QF
QS
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