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Connector
Used to connect the PC
Link Unit to the Rack.
DIP switch (SW7)
Adjusted to select Single/
Multilevel System, operating
level, mode, and number of
I/O refresh words.
4-1-2 Switch Settings
Switch settings determine how the PC Link Units will work together and how
the LR area will be allocated to data communications. All switches should be
set before mounting a PC Link Unit to the PC.
Errors in switch settings, which are not always detected by the System, can
cause incorrect data communications. Set and check all switch settings care-
fully.
The switches on the front panel are numbered from 1 through 4. They are set
using a regular screwdriver. Turn the switch until the desired number appears
in the window. Be careful not to damage the slots on the switches. Do not
leave a switch mid-way between settings.
Switches 1 and 2 determine the PC Link Unit number. Switch 1 is the tens
digit; switch 2, the ones digit. The number of the Unit thus can be read di-
rectly by considering the digits in the windows of switch 1 and switch 2 as a
single number. Each PC Link Unit in every Subsystem must be given its own
unit number. This number will determine the LR words allocated to the Unit.
The Unit assigned number 0 is the polling unit. All other Units are polled
units. Do not use the same unit number more than once in any one Subsys-
tem. Do not set a number higher than one less than the maximum number of
PC Link Units allowed in the System (see 2-1 System Configuration for spe-
cific limits). Errors in setting unit number are sometimes not detected by the
System, leading to incorrect data in the LR area. Set unit numbers carefully.
The C200H-LK401 PC Link Unit is considered a Special I/O Unit for the
C200H, C200HS, or C200HX/HG/HE(-Z) PC and must be assigned a unit
number as such. Set a number between 0 and 9. The unit number assigned
to the PC Link Unit must not be used for any other Special I/O Unit controlled
by the same PC. IR and DM words allocated to the unit number assigned are
not used by the PC Link Unit, and may therefore be used as work bits in pro-
gramming.
Back Panel
Note
Front-panel Switches
Switches 1 and 2:
PC Link Unit Number
Switch 3:
Special I/O Unit Number
C200H PC Link Units Section 4-1