EX213, 221, 230 & 233
Page 17
5.7 Power
The EX221 must be powered by an external 24V power supply, such as a DR-4524 (Order Code 9604
8563). External power should be connected per channel to the EX221 via SK6, which is clearly
labelled as to the GND and VCC connections.
Care should be taken to only apply 24 Volt power to A VCC and A GND to avoid
damage to other circuits.
It should be noted that the source driver chip could source up to 100mA for 90 % duty cycles on all
lines.
A Jumper J1, connects logic ground of the computer to the grounds of the relay drivers. A ground
connection should be made for correct operation of the board, however J1 may be removed if this
creates a ground loop.
The EX221 can be powered in two different ways. It can either be powered from the PC via the Digital
IO/Counter Timer board and the EX233 distribution panel, or it can be powered from an external
power supply, such as a DR-4524 (Order Code 9604 8563).
If J2 to J5 are fitted, power is provided from the PC. However, if jumpers J2 to J5 are removed, power
must be provided from an external power supply. External power must be connected per channel to
the EX221 via SK6, which is clearly labelled as to the GND and VCC connections. It should be noted
that a ground return path must be completed for the card to function correctly, and recommend that
the unit be powered from the computer supply with J 1 to 5 fitted.
5.8 Connections
Connections from the PC to the EX221 come via your chosen Digital IO/Counter Timer board, out via
a 78 way cable to the EX233 Distribution Panel. The EX233 splits the 72 lines of Digital IO/Counter
Timer signals into 3 groups, Groups X, Y and Z. Each group contains either three 8-bit digital IO ports
or six CLK/GATE counter timer inputs and outputs. Each group has its own 37 way D connector (male)
and a row of 26 WAGO connectors, each for an individual line. Connection to the EX221 should be
made using a 37 way cable (Order Code 9101 4890) from the EX233 to SK4 on the EX221.
Each output has either a direct ‘logic’ connection (SK2) or a two-row block of WAGO connectors (SK8
and SK10) if the board is configured for relay output.
Each input has its own I/P and 0V connection, The I/P SK7 is connected to the anode
+
side of the
opto isolator with SK9 connected to the 0V
-
cathode. Both of these inputs are clearly marked on the
silk-screen.
We recommend that opto-isolated inputs be used for all inputs to the computer. This provides a
greater tolerance to noise
For convenience Jumpers J59 - J72 connect the 0V inputs together in each group so B0 0V is
connected to B1 0V by using J66.
