Instruction manual

1-18 /Introduction ControlWaveLP
Powered Current Loop
Common Mode Range: 0V referenced to isolated common.
When a field supply common is connected to the AI system the
isolated common is connected to the field supply common.
Input Filtering: 300 milliseconds to 99.75% of input signal
Channel Settling Time: 300 microseconds
Conversion Time: 200 microseconds
On board References: 1V, 5V - optional
Surge Suppression: 38VDC MOV across input signals and (-) input to CHASSIS
500VDC MOV isolated common to CHASSIS
Meets ANSI/IEEE C37.90-1978
Terminations: Pluggable (TB3), maximum wire size is 16 gauge
Bus Access: 16 Bits Wide
FMI/OB Bd. High Speed Counter Inputs
The high speed counter circuitry consists of signal conditioning circuitry, 16 bit ac-
cumulators, and control circuitry. The signal condition circuitry includes optocouplers,
debounce circuitry and bandwidth limit circuitry.
Each counter is assigned three field inputs, SET, RESET and Common. When the debounce
circuitry is enabled, a change of state on both the SET and RESET inputs is required to
accumulate counts. The maximum input frequency is 10 KHz. The nominal input current
for an input is 1mA.
The 16 bit accumulators are synchronous counters. The counters and associated circuitry
are reset asynchronously. The input count, read and write operations are performed
synchronously with the system 6 MHz clock. Overflow of each 16 bit counter generates an
interrupt. The interrupt can be disabled by setting an associated mask bit. The inter-
rupting device is identified by reading a 4 bit value.
There are two sets of jumpers (W32 - W39) for each High Speed counter circuit. One jumper
selects an isolated input or a field powered input. The second jumper selects the debounce
mode of operation.
The 16 bit accumulators are cleared to 0000 hex on power up.
At a 10KHz input frequency, the accumulator will overflow after 6.5 seconds.
HSC Operation Summary
Number of Points: 4 (TB4)
Input Voltage Range: 12V or 24V
Input Filtering: 10KHz Max.
Input Filtering: 20 microseconds
Input Configuration: Set/Reset inputs, contact closure, externally sourced on point
by point basis with jumper configuration.
Input Current: 2.5mA ±10%
‘1’ State Voltage: 90% of input voltage range
‘0’ State Voltage: 10% of input voltage range
Bus Access: Sixteen bits wide
Max. Accumulator Value: 65536
Electrical Isolation: 1500VDC
Surge Suppression: 500VDC MOV to CHASSIS
38VDC MOV across input and to FIELD COMMON