Alpha 640 Analogue Output Module
What is the Alpha 640 Analogue Output Module?
The Alpha 640 output module provides eight 12 bit analog outputs, four individually isolated digital status or counter inputs and seven relay driver channels. The analog outputs offer uni polar voltage, bipolar voltage and current output ranges.
Each output can be set to any of three ranges 0 to +10V, -10V to +10V pr 4 to 20mA. By software commands. The analog outputs are isolated as a group from all other connections eliminating ground loop and other problems.
The relay driver outputs are suitable for direct connection to low power relays for general supervisory use.
The isolated digital inputs can be used to return status information about the equipment being controlled by the analog outputs and can also be used as general purpose inputs. Counting and low frequency measurements are also possible on these inputs up to 1KHz pulse rates.
The Alpha 640 module is intended to be used as a general purpose output facility to compliment the Alpha Metrology input measurement modules. The firmware is structured to allow specific application code to be easily added for stand alone functions to create special versions with customer specified functions.
If used with an Alpha Metrology input module, then a combination of analog and digital input and outputs could be combined as a compact assembly, operating independently from the supervisory software on the host computer.
Additional processing could be applied to inputs to create new measurement functions, and to outputs to control behavior under different conditions. However the standard 940 module is controlled from the host computer as with other modules in the range, using the RS485 high speed serial communications.
The outputs can be individually calibrated with software commands without requiring access to within the module. Similarly the firmware within the module can be updated using a serial interface should this be needed to load a custom application.
LOCAL SERIAL INTERFACE
As with most other modules in the alpha series a local serial interface can be used to program and monitor operation locally independent of the communications on the RS485 network.
This can be very convenient during installation or used later to diagnose application problems at the measurement site.
Alternatively it could be used with a permanent local process display. Customized display output can be provided. All programming can be stored in secure non volatile flash memory.
- Isolated Analog output channels
- Digital status / counter inputs
- Relay drivers
- Second local diagnostic serial interface
- High speed comms 230KB (460KB)
Number of outputs: 8
Voltage output range: 0 to +10V
Resolution: 12bit 2.5mV
Accuracy: 0.1% offsetting + 0.1% of range
Temp coefficient: 50ppm/°C setting
Voltage output range: -10 to +10V
Resolution: 12bit 5mV
Accuracy: 0.2% of range
Temp coefficient: 50ppm/°C
Current Output range: 4 to 20mV
Resolution: 12bit 5uA
Accuracy: 0.1% of range + 0.2% of setting
Temp coefficient: 75ppm/°C 25ppm/°C
Max load resistance: 400R
Isolation: Isolated as a group
Dimensions: 180 x 120 x 65mm
Weight: DIN rail mounting 0.8Kg
Status Counter Channels
Number of status channels per module: 4
Measurement functions: Status, counting
Max count rate: 1000/sec each channel (4 channel)
Input threshold: 4V
Input operating range: 4-24V
Isolation: Each channel is individually isolated.
RS485 Communication Interface: Baud rates to 230KB supported (460KB is available for some applications)
Local RS232 Interface: Baud rates to 38K4 supported.
Relay Driver Channels
Number of relay drivers: 7
Driver output rating: 26V 100mA
Protection: 30V clamp zener
Isolation: These drivers are not isolated.
Software: No internet access required.
-20 to 60°C ambient.
0 – 90% RH
12 – 36V DC or 24V AC Power < 7W