Installing the 1779KFM Interface
Chapter 4
44
On the front of the 1779-KFM interface is a set of three link-address
thumbwheel switches (Figure 4.3).
Set these switches to designate the link address of the node. The top
switch represents the most-significant digit (MSD). The bottom two
switches do not go past the digit 7; this is because the link address must be
an octal number. The top switch does not go past the digit 3; this is
because the highest link address available to a node is 376. Because the
1770-T3 industrial terminal cannot address Words 000 through 007 or 100
through 107, select a number from 10 through 77 or 110 through 376.
Give each node of the link a unique link address. The token will pass
from node to node by order of link address.
Figure 4.3
LinkAddress Thumbwheel Switches
MSD
LINK
ADDRESS
EXIT
COMPLETE
EXIT
REQUEST
TEST
RUN
RESET
ACTIVITY
SAT
NORMAL
READY
TRANSMIT
RECEIVE
At each of the four corners on the front of the interface is a captive screw.
You can tighten or loosen these screws by hand with the knobs of the
screws. Loosen the screws; then grasp the knobs to pull the removable
frame out 3 inches to the switch-setting position.
With the removable frame pulled out, the host-board switches are exposed
on the left side of the removable frame assembly. On the left side of the
stationary frame is a label that indicates the function of each host-board
switch (Figure 4.4).
Setting Link Address
Setting HostBoard Switches