AC/DC Polarity-Free Digital Inputs
1000V DC Input Isolation
Features
Applications
Hardware Description
The ACL-7225 is an extension version of ACL-7125. It provides 16 electro-mechanical relays for output actuation and 16 isolated digital inputs. It can plug directly into an AT-bus slot of any IBM PC or compatibles.
Relay Outputs
The 16 electro-mechanical relay outputs are addressed as two I/O bytes. Eight of the relays
(outputs 0~4 and 8~12) are Form C contacts (normal open and normal closed) and the remaining relays
are Form A (normal open only). A LED indicates each relay's ON/OFF status for monitoring.
Relay type : Single-Pole, Double-Throw (SPDT)
Output channels : 16 (0-4 and 8-12 are Form C; 5-7 and 13-15 are Form A)
Contact rating : 120V AC/0.5A or 24V DC 1A
Contact type : Bifurcated
Contact resistance : 100MW max.
Relay ON/OFF time : 5 msec typical
Coil voltage : +12V @ 33mA for each relay
Isolated Inputs
The 16 opto-isolated D/I channels are used for sensing digital inputs and provide 1,000V DC for
isolation. Can be configured as AC filter or Non-AC filter by jumper settings.
Opto-isolator : PC-814
Input channels : 16
Input signal : AC, non-polarized
: DC, non-polarized
Input voltage : 5~24V DC or AC 50~1,000Hz
Input impedance : 1.2KW
Isolation voltage : 1,000V DC channel-to-channel and channel-to-ground
Response time : 20µsec without AC filter, 2.2ms with AC filter
Power Consumption
+5V DC : 400mA typical
+12V DC : 550mA max., all relays are energized
Physical/Environment
Operating temp : 0°C~60°C
Storage temp : -20°C~80°C
Humidity : 5~90%, non-condensing
Dimensions : 175mm(L) x 121mm(W)
DOS Program Library/Windows DLL Drivers (ACLS-DLL1)
An extensive library of functions are available that support
Microsoft C and Borland C/C++ under DOS environment. All the
source codes and some demo programs are included for reference.
A high performance Windows driver for Digital I/O functions are supported. It can be accessed from C, C++ and Visual Basic under Windows 3.x environment.
Software Description
I/O Port Address Map
The ACL-7225 uses 4 consecutive I/O locations in the computer's
I/O addressing space. The four registers are at Base Address
+0, +1, +2 and +3. Register descriptions are listed in the table below.
| BASE + 0 | Relay Output Reg. (RO0~RO7) | R/W |
| BASE + 1 | Relay Output Reg. (RO8~RO15) | R/W |
| BASE + 2 | Isolated Input Reg. (DI0~DI7) | R |
| BASE + 3 | Isolated Input Reg. (DI8~DI15) | R |
| Electromechanical Relay Contacts There are several forms or types of mechanical relay contacts. The following table shows the description of relay contact types: |
|
| FORM Name | SWITCH Configuration |
| FORM A (Normally Open) | SPST-NO (Make) |
| FORM B (Normally Closed) | SPST-NC (Break) |
| FORM C (Changeover) | SPDT (Break, Make) |
| Note:SPST - Single Pole Single Throw SPDT - Single Pole Double Throw |
|
| Cat No. | Description | Price |
| ACL-7225 | 16 Channel Relay Actuator & Isolated D/I Card | $179.00 |
©1995 Circuit Specialists, Inc.