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The FANUC Series 18 occupied the mid-tier of FANUC's CNC range during its production years — above the Series 0 in capability but below the high-end Series 15 and 16. The "B" model was the second hardware generation of the Series 18, with refined electronics and enhanced performance relative to the 18-A.
Two machine tool application variants:
F18-M (Machining Centre): Configured for milling machine tools — machining centres with XYZ axes plus optional rotary axes. The Series 18-M provides the interpolation functions, tool compensation, and high-speed look-ahead needed for machining centre applications.
F18-T (Turning Centre): Configured for turning machine tools — CNC lathes and turning centres with X and Z axes plus optional C and Y axes. The Series 18-T includes turning-specific functions: constant surface speed control, threading cycles, and turning-related canned cycles.
The A16B-2202-0860 serves both F18-M and F18-T as confirmed by its description "F18M/T B MAIN CPU 4 AXIS."
| Parameter | Value |
|---|---|
| Compatible | Series 18-B (F18-M, F18-T) |
| Board Type | Main CPU board |
| Axis Count | 4 axes |
| Series | A16B-2202 |
The main CPU board in the Series 18-B architecture is the central hub for all CNC functions:
Programme interpolation: The main CPU calculates the position commands for all axes at every interpolation cycle. Each servo axis receives its command from this board — position errors are computed and corrected in real time.
PMC execution: The Series 18-B's PMC (Programmable Machine Controller) ladder programme runs on the main CPU board, scanning the machine I/O and executing the machine sequence logic.
System bus: Option boards, memory modules, servo interface cards, and communication boards all connect through the main CPU board's bus structure. The main CPU orchestrates all inter-board communication.
CNC display: The Series 18-B's display output and operator panel input are managed from the main CPU board — keystrokes from the MDI keyboard reach the CNC, and screen content is generated for the CNC display.
Series 18-M 4-axis machining centre CPU failure: A FANUC F18-M machining centre with a rotary table develops a complete CNC failure. The A16B-2202-0860 is identified as the fault. Replacement restores all four machining axes and the PMC sequence programme.
Series 18-T multi-axis lathe main board replacement: A CNC turning centre with C-axis capability requires a main CPU board replacement. The A16B-2202-0860's 4-axis capability covers the Z, X, C, and Y axes of the turning centre configuration.
Q1: What is the difference between the Series 18-B main CPU board and the Series 18i-A main board?
The Series 18-B (A16B-2202-0860) is a pre-i generation board — it belongs to the older hardware architecture before FANUC introduced the "i" generation (Series 18i). The Series 18i-A uses a completely different main board series (A20B-8100-0135 platform, etc.) with updated processor architecture. The Series 18-B board is not compatible with the Series 18i hardware.
Q2: Does A16B-2202-0860 support simultaneous 4-axis interpolation or only 4-axis indexing?
The Series 18-B supports multi-axis simultaneous interpolation. Whether simultaneous 4-axis linear and circular interpolation is active depends on the CNC's installed software options. The A16B-2202-0860 provides the 4-axis hardware capacity; the specific interpolation capability is enabled through FANUC option software.
Q3: Does replacing A16B-2202-0860 require full CNC re-commissioning?
CNC parameters (axis gains, software limits, acceleration settings) are stored in SRAM memory modules — not in the main CPU board. Replacing A16B-2202-0860 with the intact SRAM modules transfers all machine-specific data to the new board automatically on boot. Verify that all four axes respond correctly and test the PMC sequence before returning to full production.
Q4: What memory modules accompany the A16B-2202-0860 in the Series 18-B control?
The Series 18-B control uses FROM modules (for system software) and SRAM modules (for parameters and programmes) — these are separate plug-in boards from the main CPU board.
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