FANUC controls use a "From/SRAM" module or a PCMCIA Flash Memory card (depending on the generation) to store the system software.
: This clears the SRAM and can fix issues caused by corrupted system files. To access this, hold the Prev and Next
The history of this software is fascinating. In the days of the and System 0 (legendary CNC systems), the "Starting System" was rigid. It was burned onto chips. If you needed to upgrade the boot software, you physically replaced computer boards.
If the system loads, try turning it off and back on normally to see if it fixes the issue. If not, you may need a system backup (see step 3). 3. Image Backup Restoration
If you have a PCMCIA card or a USB drive inserted into the operator panel during startup, the controller might attempt to boot from it. Alternatively, a short circuit in a peripheral device or a communication cable can freeze the bus lines. 4. Power Supply Unit (PSU) Voltage Drops fanuc starting system software please wait
The duration of this "wait" state is a diagnostic goldmine for an experienced technician. Under normal circumstances, depending on the Fanuc series (from the legacy Series 0 to the modern 30i-B or 31i-B), the boot process should take between 30 seconds and two minutes. A normal, predictable wait indicates a healthy system. However, an unexpectedly prolonged wait—or an infinite loop of the message—signals deeper trouble. Common culprits include a corrupted system software file, a failing memory module on the main board, a depleted backup battery that has caused parameter or program loss, or even a hardware failure in the boot device itself. In these pathological cases, the "Please Wait" message transforms from a mundane status into a cry for help, often requiring the restoration of "from SRAM" data or a complete clean installation of the executive software.
If you have a known good backup file (SRAM.FDB or similar) on a memory card: Select from the Boot System menu. Select RESTORE (CARD -> CNC) .
Before diving into the specifics of the "Fanuc Starting System Software Please Wait" message, let's briefly introduce Fanuc. Fanuc is a Japanese multinational company that specializes in the production of industrial robots, CNC machines, and other automation equipment. Fanuc's CNC machines are widely used in various industries, including aerospace, automotive, and medical device manufacturing.
If none of the above steps work, the system software itself may be corrupt. This requires reloading the FANUC executive and option software from a backup. FANUC controls use a "From/SRAM" module or a
If a power cycle does not resolve the issue, check the following hardware components:
During a normal startup, the FANUC CNC control unit (such as the 16i, 18i, 21i, or 0i series) runs a Power-On Self-Test (POST). It then initializes the hardware components and loads the system files from its physical memory into the volatile working memory (RAM).
Locate the test points on the FANUC Power Supply Unit (typically found on the main control slot).
Unplug Ethernet cables and serial RS-232 communication lines. In the days of the and System 0
Using a digital multimeter, check the test points on the FANUC power supply unit to verify it outputs a steady +5VDC. When to Contact a Professional
The most frequent cause is a corrupted FROM (Flash ROM) or SRAM chip. This happens during improper shutdowns, power surges, or when the backup battery dies while the machine is off.
If the hardware is functional, attempt to bypass the standard user interface boot routine by entering the system maintenance mode. Turn the control power off.