The GE IS220PAOCH1A, also cataloged as the IS220PAOCH1A analog output module, serves as the primary PAOC hardware used to execute 0–20 mA current‑loop output functions across Mark VIe control platforms.
Hardware Specifications
Parameter
Specification
Model
IS220PAOCH1A
Brand
GE
Origin
USA
Weight
Not specified
Dimensions
8.26 cm high x 4.19 cm wide x 12.1 cm deep
Operating Temp
-30 to 65 deg C
Power Consumption
Not specified
Output Channels
Eight current outputs
Output Range
0–20 mA
Load Capability
Up to 900 ohm
Accuracy
±0.5 percent over full temperature range
Technology
Surface‑mount
Ethernet
Dual RJ‑45 ports
Connector
DC‑37 pin terminal‑board interface
Backplane Bus Communication Velocity Behavior
As part of the GE Mark VIe platform, the PAOC module interfaces with the I/O network through dual Ethernet ports and a DC‑37 connector. The board’s acquisition circuitry maintains deterministic timing for current‑loop updates, with controlled impedance routing to stabilize backplane communication velocity. This ensures predictable propagation delay for output commands and minimizes skew across simplex output channels.
Frequently Asked Questions
Q: Can the IS220PAOCH1A be hot‑plugged? A: Yes. The pack includes soft‑start circuitry that limits inrush current, allowing power to be applied without disconnecting the cable.
Q: Does the PAOC module impose significant load on the terminal board? A: The module sources loop current, but terminal‑board loading remains within standard burden‑resistor limits.
Q: How is output accuracy maintained? A: Each channel includes an A/D converter for current feedback, allowing the processor to track commanded versus measured loop current.
Field Installation Guidelines
Secure the terminal board before attaching the PAOC module to avoid connector strain.
Ensure the DC‑37 connector is fully seated and free of lateral force.
Maintain shield continuity for all current‑loop wiring to reduce noise pickup.
Route analog output wiring separately from high‑energy conductors.
Verify correct Ethernet port assignment when dual networks are used.
Confirm loop load does not exceed 900 ohm before commissioning.
