Fanuc A350-8101-T184 Circuit Board

A350-8101-T184 | FANUC CNC PCB Module — 7-Segment LED / 24VDC / 15A / IP67 / Industrial-Grade Sealed Design

A350 Fabrication Numbers — FANUC's PCB Internal Reference

FANUC's part numbering uses several prefix conventions. The A06B, A16B, and A20B series identify commercial order parts. The A350 prefix identifies FANUC's PCB fabrication numbers — the internal drawing reference that FANUC uses to identify specific PCB designs at the circuit board manufacturing level. PCBs bearing an A350 number are genuine

FANUC-designed boards associated with their commercial product assemblies.

The A350-8101-T184 is one such fabrication-referenced PCB, used in FANUC CNC machine applications. The T184 suffix identifies this specific board variant within the A350-8101 design family.

Key Specifications

7-Segment LED Display — Status at a Glance

The 7-segment LED display provides a numeric or alphanumeric status indication visible directly at the PCB's mounting location. In FANUC CNC and drive systems, 7-segment LED displays commonly serve as:

Alarm code displays: Servo amplifiers and spindle amplifiers use 2-digit 7-segment LEDs to show fault codes when an alarm is active. The code visible on the amplifier's LED display directly identifies the fault type without requiring access to the CNC operator screen.

Status indicators: Normal operating states, ready state, and initialisation progress can be indicated through defined LED segment patterns.

Diagnostic readout: During commissioning or troubleshooting, the 7-segment display provides a first-level diagnostic indication at the hardware without requiring a laptop or external monitor.

Application Scenarios

CNC machine panel I/O with LED status: A CNC machine tool mounts the A350-8101-T184 in a sealed housing close to the work area. The 7-segment LED display provides visible alarm code output at the machine body, readable by the operator without looking at the main CNC panel.

Drive module status display: A FANUC drive module within the machine incorporates the A350-8101-T184 as its front-facing LED status PCB. The board's IP67 rating protects against coolant mist that reaches the drive area on this machine configuration.

Machine replacement PCB: A CNC machine develops a fault traced to the A350-8101-T184 PCB. The replacement board — matching the IP67 and 7-segment LED specification — is fitted to restore full machine function.

FAQ

Q1: What does the A350 prefix indicate compared to A16B or A20B FANUC part numbers?

The A350 prefix identifies a FANUC PCB fabrication (drawing) number — an internal circuit board design reference used in FANUC's manufacturing process. The A16B and A20B prefixes are commercial part numbers used for ordering. An A350 board is a genuine FANUC-designed PCB that may correspond to a commercial assembly with a different part number, or may be stocked and supplied under the A350 fabrication number directly. 

Q2: Why does this PCB need IP67 protection rather than standard PCB protection?

IP67 protection is needed when the PCB is installed in an environment where it may be exposed to coolant spray, wash-down water, or metallic particle contamination from the cutting area. Most CNC controller PCBs are fully enclosed in sealed cabinets and do not require IP67. The A350-8101-T184's IP67 rating indicates it is designed for a more exposed mounting location — on the machine body, inside a machine-mounted sealed housing, or in a panel position where environmental exposure is part of the operating condition.

Q3: Can the 24VDC supply for the A350-8101-T184 come directly from the CNC power supply?

Yes, provided the CNC power supply's 24VDC rail has sufficient capacity to supply the A350-8101-T184's 15A current demand alongside all other 24V loads in the system. If the total 24V load approaches the power supply's rating, a dedicated 24VDC supply for the high-current loads (including the A350-8101-T184) may be appropriate. Consult the machine's electrical documentation to verify the 24VDC supply capacity.

Q4: What types of 7-segment LED patterns are used as status codes on FANUC modules?

FANUC uses 2-digit 7-segment LED displays on drive modules (servo, spindle, power supply) to show two-character codes. Normal operating states are typically indicated by dashes or specific number combinations. Alarm states display numeric codes — for example, "01" through "99" covering various alarm categories. The specific code meanings for any FANUC module with a 7-segment display are documented in the corresponding module maintenance manual.

Q5: How is the A350-8101-T184 replaced — is it a plug-in or soldered component?

The replacement method depends on how the A350-8101-T184 is mounted in the specific machine assembly. PCB modules in FANUC systems are typically connector-mounted (edge connectors, header connectors) rather than soldered directly to another board. If the T184 board connects via a plug-in connector, replacement is a field-serviceable operation. If it is integrated into a sealed assembly, the entire sealed unit may need to be replaced rather than just the PCB. Confirm the mounting arrangement from the machine's electrical documentation.