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DB-28040
Introduction
The DB-28040 is an I/O expansion daughter board for the CDS-3310 motion controller that provides 8
analog inputs and 40 digital I/O.
Electrical Specifications
The analog input impedance is 45.7k. Standard configuration allows for 3.3 V digital I/O. The DB-
28040-5V option provides up to 24 Open-collector outputs that can sink to 5 Volts (3mA). In the -5V
configuration, the first 3 banks of 8 bits may be configured as outputs. There is no limitation on the
placement of inputs. The following tables illustrate the various Input/Output combinations:
DB-28040 Valid I/O
Inputs
40
32
24
16
8
0
*Note: Only the first three I/O banks may be configured as outputs
16 bit Analog Inputs
The DB-28040 comes with eight 12-bit analog inputs standard. For 16-bit analog inputs, order the
DB-28040-16. When using the AF command with the -16 version, the controller requires the 16-bit
Analog Feedback firmware.
Interfacing to the Digital I/O
The DB-28040-5V offers up to 32 digital I/O points that can interface directly to I/O racks such as
Grayhill 70GRCM32-HL, Galil IOM-1964, and OPTO-22 (see next section). These I/O points can be
configured as inputs or outputs in 8 bit increments with the CO command. The I/O points accessed
from the J1 header of the DB-28040-5V are connected directly to the I/O rack using a 50-pin IDC
ribbon connector. Unused banks must be configured as inputs and will be grounded by the I/O rack.
Using Opto-22 G4 Series Racks with DB-28040
When using Opto-22 G4 series I/O racks with Galil extended I/O, special considerations must be made
depending on the models described below. Due to changes to the pinout orientation of the 50-pin
header of the G4 rack input, damage may occur to Galil components, or the opto rack may not be
properly powered.
In the past, Opto-22 racks adhered to a "standard" pinout configuration for the 50-pin IDC header that
mated with Galil extended I/O headers. The standard pinout configuration of the 50-pin header on
Galil products allows the Galil to power the opto-isolated relays by supplying 5 VDC at pin-49.
CDS-3310
Outputs
0
8
16
24
32
40
DB-28040-5V Valid I/O
Inputs
*Outputs
40
0
32
8
24
16
16
24
i
Appendices
95
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