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Use this quick-reference guide to diagnose and configure Stanley MC521 / MC521 Pro automatic sliding doors. Click any item below to expand the meaning, common causes, and what to check next.
Display behavior note: If the current status code is 00 (Normal operation - All OK), the MC521 Pro will show the current door state. Otherwise, the controller alternates between showing the current status code and the door state.
Need help identifying a code or part? Call 877-412-3667 or email [email protected].
Important: Door must be cycled open for changes to be stored in permanent memory.
Tip: Use Ctrl+F / Cmd+F to find an index like 96, 97, 98, or 99.
Description: Standard adjustable settings including speeds, checks, torques, monitoring, delays, and other configuration values.
Description: Reserved indexes - not typically used for field adjustment.
Action: Entering 01 will cause FIS to restart.
Action: Entering 01 will display FE followed by two pairs of digits followed by FE.
Example: Firmware 0609 displays: FE - 06 - 09 - FE
Action: Entering 01 will cause auto configuration (learn cycle) to restart.
Lock: Entering 01 locks all value inputs except this index to prevent inadvertent changes.
Unlock: Entering 00 unlocks values so adjustments can be made.
| Index | Min | Max | Description | Default (Single) | Default (Dual) |
|---|---|---|---|---|---|
| 00 | 05 | 35 | Open speed (increment by 1) | 25 | 25 |
| 01 | 05 | 18 | Close speed (revolutions per second) | 12 | 12 |
| 02 | 03 | 10 | Check speed (revolutions per second) | 04 | 04 |
| 03 | 10 | 99 | Open check length (% of full opening) | 35 | 35 |
| 04 | 10 | 99 | Close check length (% of full opening) | 30 | 30 |
| 05 | 00 | 99 | Reduced open position (% of full opening) - 00 = full open, 99 = full close | 50 | 50 |
| 06 | 01 | 99 | Hold open delay (0 to 25 sec.) | 03 | 03 |
| 07 | 00 | 01 | Lock logic - 01 = Fail Secure, 00 = Fail Safe | 01 | 01 |
| 08 | 00 | 75 | Open torque (% of full scale) | 25 | 25 |
| 09 | 00 | 75 | Close torque (% of full scale) | 25 | 15 |
| 10 | 00 | 75 | Check torque (% of full scale) | 25 | 10 |
| 11 | 00 | 01 | Dura-Glide function switch type - 00 = double pole rotary, 01 = rocker | 01 | 01 |
| 12 | 00 | 01 | 2S operation - 0 = off, 1 = on | 00 | 00 |
| 13 | 01 | 60 | Obstruction time delay (.01 - 1.5 sec) - heavy and dual motor doors may require longer time | 12 | 40 |
| 14 | 20 | 60 | Open acceleration (larger value = faster acceleration) | 50 | 50 |
| 15 | 20 | 60 | Open braking (larger value = increased braking) - 20 = no open braking | 54 | 54 |
| 16 | 20 | 60 | Close acceleration (larger value = faster acceleration) | 20 | 20 |
| 17 | 20 | 60 | Close braking (larger value = increased braking) - 20 = no close braking | 40 | 40 |
| 18 | 00 | 02 | Delay egress - 00 Off, 01 = 15 sec delay, 02 = 30 sec delay | 00 | 00 |
| 19 | 00 | 04 | Monitor type - 00 Standard Monitor, 01 StanVision, 02 Wizard, 03 Active Eight, 04 Standard No Monitor | 04 | 04 |
| 20 | 00 | 01 | Hold beam type - 00 = Optex, 01 = Self-Contained | 00 | 00 |
| 21 | 01 | 50 | Lock delay (0.1 - 0.5 sec) | 01 | 01 |
Meaning: Controller is healthy. Door state will display when status is 00.
Meaning: Breakout condition detected. Check breakout switch/circuit and reset breakout hardware.
Meaning: General system fault. Verify power, wiring, and safety circuits.
Meaning: Controller is in FIS programming mode.
Meaning: Door is running learn/auto configuration.
Meaning: Learn cycle completed and confirming values.
Meaning: Encoder/rev counter signal issue. Inspect encoder harness and connector.
Meaning: Shear lock energized (locked).
Meaning: Cycle counter display mode.
Meaning: Obstruction detected. Check track/threshold debris and door binding; verify encoder if no obstruction found.
Meaning: Delayed egress active. Verify Index 18 setting.
Meaning: Shear lock de-energized (unlocked).
Meaning: Upper hold beam fault. Check alignment, wiring, and beam path.
Meaning: Door held open by an input. Check beams, presence sensors, and switch mode.
Meaning: Learn length mismatch. Ensure door moves freely and rerun learning if needed.
Meaning: Safety input fault. Verify wiring and Index 19 monitoring type.
Meaning: Inside activation fault. Check sensor and wiring.
Meaning: Outside activation fault. Check sensor and wiring.
Meaning: Lower hold beam fault. Check alignment, wiring, and beam path.
Meaning: Inside presence input fault. Verify sensor and monitoring configuration.
Meaning: Outside presence input fault. Verify sensor and monitoring configuration.
Meaning: Active8 monitored sensor failure (inside). Verify Index 19 if using Active Eight monitoring.
Meaning: Active8 monitored sensor failure (outside). Verify Index 19 if using Active Eight monitoring.
Meaning: Upper Telco hold beam failure. Check alignment, wiring, and replace beam if needed.
Meaning: Lower Telco hold beam failure. Check alignment, wiring, and replace beam if needed.
Meaning: Door is fully closed.
Meaning: Door is opening.
Meaning: Door is slowing/checking near full open.
Meaning: Door is fully open and holding.
Meaning: Door is closing.
Meaning: Door is slowing/checking near full closed.
Meaning: Door stopped during opening.
Meaning: Door stopped during closing.
Meaning: Door is applying close press behavior.
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