Virginia Controls, LLC
MH-3000 User Manual, 1_03C10-VC
Page 42
5.5.2.1
Addressing
Each Input/Output board is given a unique address by
means of the Address Switch Block on the right of the
board, next to the I/O COMM OUT Connector. The first
board connected to the CPU is address 1, the next is
address 2, and so on. The numbering is consecutive, and
no numbers are skipped. To set the address, refer to the
chart below. ON indicates the switch is set to the right,
OFF indicates the switch is set to the left, as indicated on
the switch itself.
Picture at right shows DIP Sw. 1 to the right, and all
the others to the left, which is the address for Board 1, as
shown in the table below.
Board #
Sw. 1
Sw. 2
Sw. 3
Sw. 4
Board #
Sw. 1
Sw. 2
Sw. 3
Sw. 4
1
ON
OFF
OFF
OFF
5
ON
OFF
ON
OFF
2
OFF
ON
OFF
OFF
6
OFF
ON
ON
OFF
3
ON
ON
OFF
OFF
7
ON
ON
ON
OFF
4
OFF
OFF
ON
OFF
8
OFF
OFF
OFF
ON
NOTE: If a board is replaced, the board must be set up with the SAME
ADDRESS as the board it was replacing. The address of each I/O point is
determined by the Board Number (1 through 8), then the Point Number (1
through 16). The board number is used in the “Show I/O” screen to indicate
which board is being monitored.
5.5.2.2
Terminal Wiring
Wiring to Inputs 1-8 is at the TOP LEFT of the I/O board, wiring to the Outputs 1-8 is at
the TOP RIGHT of the I/O board. Wiring to Inputs 9-16 is at the BOTTOM LEFT of the I/O
board, wiring to the Outputs 9-16 is at the BOTTOM RIGHT of the I/O board.
The terminal blocks are removable, so BEFORE power is applied, remove the terminal
blocks and check for grounds at the terminal blocks.
Note also the location of the COMMONS, as shown on the schematic. The far left
terminal is the common for the four I/O points to its immediate right, and the sixth terminal
from the left is the common for the four I/O points to its immediate right.
WARNING: Be very careful not to jump to a common when you
intended to jump to an input or output, as this could damage the
controller or other equipment.
Com
1
2
3
Com
5
6
7
4
8
Typical I/O Board Terminal Block Layout
