Siemens Moore 353 User Manual page 74

Function Blocks
3.2.36 DIS_ - Digital Input _ State
DIS_ function blocks, in firmware 1.30 and higher, convert a 16-
bit word received from a single node on the LonWorks network
into 16 block outputs for interconnection to other function blocks
within the controller. A maximum of 6 DIS 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. DIS02). Input connections are
established by 'binding' the output variable of type SNVT_state
(SNVT #83) in the remote node to the network variable in the DIS
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 viewing the number that the
station has assigned to input 0.
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.
The function block also has a quality status output associated with
it. This status will go high (1) when the block determines it has lost communication with the Lon node.
LON
option board
node u
LON node r1
LON network
nv x1 SNVT_
nv _ SNVT_
nv x1 binding
node u, nv *0
BLOCK DIAGRAM
3-44
Station
N
O0 .
F
0
F
N
OF .
F
F
F
QS
Quality Test
DIGITAL INPUT _ STATE
DISnn
LONWorks
Network
O0
DIGITAL INPUT
STATE
nviDSnn0 O1
nv*
SNVT _ state
0
O2
O3
O4
O5
O6
O7
O8
O9
OA
OB
OC
OD
OE
OF
QS
V
N N U M
N V NUM
view etwork ariable ber (nv *) .... 1 to 2000
UM353-1
Output 0
Output 1
Output 2
Output 3
Output 4
Output 5
Output 6
Output 7
Output 8
Output 9
Output A
Output B
Output C
Output D
Output E
Output F
Quality Status
(*)
March 2003