Ransburg Serial Node Adapter LECU4002_78553 - Manual (Page 11)

MODES OF OPERATION
The Serial Node Adapter/Serial Node Adapter +
has three modes of operation, determined by what
modules need to be operated. The three modes
are: 1) MicroPak, 2) NPB (1 MicroPak, 1 Serial
Atomizer), and 3) Flex mode.
MicroPak Mode
MicroPak mode is for communication with the
MicroPak only, up to four units. This mode is
selected by setting SerNA dipswitch SW2-1 to
OFF. SW2, positions 5, 6, 7, and 8 must be set
to OFF. PLC data mapping information is shown
in Table 1 of the PLC I/O section.
NPB Mode
Node Per Bell mode communicates with one
MicroPak and one Serial Atomizer module and
is selected by setting SerNA dipswitch SW2-1 to
ON. SW2, positions 5, 6, 7, and 8 must be set to
OFF. PLC data mapping information is shown in
Table 2 of the PLC I/O section.
Flex Mode
Beginning with Serial Node Adapter/Serial Node
Adapter + version 2.02 software, this module has
the capability of communicating with one MicroPak
and any combination of Serial Atomizer (SerAT),
and Serial Digital (SerDG) modules, up to a total
of 12 modules. Note: Serial Atomizer must
have version 3.0 or higher Eprom (77118-05)
and it's SW2-4 in ON position. Space is also
reserved for Serial Analog (SerAN) modules, pres-
ently under development. This is the FLEX mode
of operation. The new version 2.02 software is
completely compatible with the old MicroPak and
Node Per Bell modes as long as the Serial Node
Adapter/ Serial Node Adapter + dipswitch SW2
is set correctly. For these older modes, SW2,
position 5, 6, 7, and 8 must be set OFF, as is cur-
rently done on Serial Node Adapter modules with
software earlier than 2.02. With these settings,
the Serial Node Adapter/Serial Node Adapter +
looks the same to the PLC and other modules as
the older versions.
In the FLEX mode, on power up, before sending
data to modules, the Serial Node Adapter/Serial
Node Adapter + will read the local serial bus and
determine what module is in what location. It will
then read a group of three configuration words,
which are programmed into Block Transfer Writes
from the PLC. (The instructions for making up
these configuration words are given in Appendix
1). While making this comparison, the module will
flash its "CPU" indicator. If these two configura-
tions are the same, the Serial Node Adapter/Serial
Node Adapter + will begin communication with the
local modules, and the "CPU" indicator will stay
on solid. This method of redundant configuration
checking will prevent data from being sent to the
wrong module in case of a faulty module or one
having been removed. (PLC data mapping infor-
mation is shown in Table 3 of the PLC I/O Section.)
Flex Mode Settings
The setting of the four dipswitches, SW2, 5-8 is
critical to proper operation. (See Figure 6 entitled
"SW1, SW2, and SW3 Switches". ) In order to en-
able FLEX mode, SW2-1 must be ON. If SW2 - 1
is ON, the positions 5-8 mean:
Position 5:
OFF means the mode is determined by SW2-1,
either MicroPak only or NPB (one MicroPak and
one Serial Atomizer). In this mode the Serial
Node Adapter version 2.02 is backward compat-
ible with existing applications.
ON (with position 1 ON) means the new FLEX
mode. This means the PLC programmer must
include the configuration information in the first
three words of BTW.
Position 6 and 7:
These are used, as shown in Figure 1, to set the
logical rack size of the node adapter as it appears
to the PLC. The number of SerDG modules on
the bus determines the size.
Again, the Serial Node Adapter could do this
function automatically, but a faulty module or
modules removed could create an erroneous
reading.
Serial Node Adapter/Serial Node Adapter + - Introduction
Ransburg
7 LN-9238-02.3