Pulse Input Analog Output Module | Yokogawa AAP849-S00
Manufacturer: Yokogawa
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Part Number: AAP849-S00
Condition：New with Original Package
Product Type: Pulse Input Analog Output Modules
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Country of Origin: Japan
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Yokogawa AAP849-S00 Pulse Input Analog Output Module
The Yokogawa AAP849-S00, also cataloged as the AAP849-S00 Pulse Input / Analog Output Module, operates as a dedicated hardware component for converting pulse train signals into proportional 4-20 mA analog currents within CENTUM VP process control network node units.
Suffix Breakdown & Model Matrix
The suffix codes appended to the base AAP849 model designate specific operational configurations and revision hardware parameters:
- AAP849: Base module hardware designation for the 8-channel pulse input and 8-channel analog output assembly.
- -S: Designates the standard module type without specialized intrinsic safety barriers.
- 0: Indicates standard type functional logic without tailored firmware additions.
- 0: Specifies basic type execution with default physical terminal configurations.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AAP849-S00 |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | 0.3 kg (0.66 lbs) |
| Dimensions | Standard CENTUM VP card slot footprint |
| Operating Temp | 0-50 deg C |
| Power Consumption | 310 mA at 5 VDC, 250 mA at 24 VDC |
| Input Channels | 8 pulse input channels |
| Output Channels | 8 analog output channels |
| Input Type | Transistor contact (open collector) |
| Input Frequency Range | 0 to 12 kHz |
| Output Signal | 4-20 mA DC |
| Output Load Resistance | 0 to 750 ohm |
| Output Step Response Time | 40 ms |
| Data Update Period | 1 ms (Input), 10 ms (Output) |
| Isolation | Non-isolated |
| Redundancy | Supports dual-redundant configuration |
Process Control Signal Processing
This module incorporates dedicated channel-to-channel pulse conversion logic designed to maintain signal precision across dynamic flow measurement loops. Furthermore, internal signal conversion circuits process incoming transistor contact inputs along trailing edges to guarantee precise frequency counting up to 12 kHz. The onboard digital-to-analog system executes output step updates within 40 ms, suppressing step changes during rapid primary loop transitions. Because the internal circuitry employs a non-isolated architecture, external isolation amplifiers or properly grounded field power supplies mitigate ground loops across the 4-20 mA HART loop protocol interfaces. Additionally, the unit continuously checks loop connectivity, setting output levels below 0.65 mA to signal open-circuit faults directly to the main controller.
Frequently Asked Questions
Q: How does the module react during field wiring disconnection on an analog output channel?
A: The module executes circuit-open detection when loop current drops below 0.65 mA, signaling an explicit diagnostic error code across the internal bus backplane.
Q: Can two AAP849-S00 modules operate in a hot-standby configuration?
A: Yes, the unit supports dual-redundant placement inside paired I/O node slots, allowing automatic output switching without interrupting the 4-20 mA control loop.
Field Installation Guidelines
Mount the module directly into a compatible CENTUM VP I/O node chassis slot until the top and bottom retaining latches lock fully into position. Connect external field signals via a dedicated KS1 interface cable to maintain stable contact resistance and minimize electrical signal reflection. Ensure field wiring shielding grounds at a single common earth bus bar to prevent common-mode noise corruption, as internal input channels share a non-isolated signal ground plane. Verify supply voltage levels to maintain input power within the specified nominal ranges of 5 VDC and 24 VDC. Maintain adequate vertical chassis spacing within the enclosure to allow unobstructed thermal convection across surrounding heatsinks during continuous duty cycles.