BECKHOFF EL5102 Encoder Terminal Debugging and Troubleshooting

When the speed is too low, the "Extrapolation stall" status bit (0x60n0:08) is set, indicating that the incremental interpolation is invalid. At this time, the original count value should be used.

5.4 Timestamp function

EL5102 can output 64 bit high-precision timestamps for the following events (based on distributed clocks, with a resolution of 1ns):

Last count pulse (0x60n0:16 "Timestamp")

Positive edge of zero pulse C (0x60n0:1F "Timestamp C")

Latch input latch event (0x60n0:20 "Timestamp latch")

Gate/Match input latch event (0x60n0:21 "Timestamp latch 2")

Required condition: The terminal must operate in DC synchronous mode.

Interference pulse filter configuration

The input filter of EL5102 is disabled by default (0x80n0:08 "Disable filter"=TRUE) because the input circuit is optimized for high-speed signals, with almost no attenuation for microsecond level pulses, and interference signals are easily misjudged as valid counts.

Parameterization steps:

Set 0x80n0:08 to False (activate filter).

Select the frequency value (10kHz~5MHz) in the "Filter settings" at 0x80n1:19. The filter frequency should be lower than twice the maximum output frequency of the encoder.

Note: When the filtering frequency is below 1MHz, the filter acts on both the Latch and Gate inputs simultaneously.

Overfrequency counter: If the input signal frequency exceeds the set value of the filter, the internal counter increments (0xA0n0:16 "Filter violation counter"), which can be reset by the command object 0xFB00:01 (0x9154/0x9164).

Diagnostic and Troubleshooting Ladder Table

Troubleshooting steps for possible causes of fault phenomena

LED A/B/C does not light up, but the encoder has a signal signal type selection error. Check if 0x80n1:1D "Counter mode" matches the encoder type (RS422/TTL/OC)

Check if the Power ENC LED is on when the counter value is 0 and the encoder power supply is missing or the wiring is incorrect; Measure+Ue terminal voltage; Confirm paired connection of differential signals

Swap A and B (or/A and/B) cables with reverse A/B phase connection for counting direction; Or set 0x80n0:0E=TRUE to reverse direction

Numerical jump or jitter interference signal or filter not activated filter (0x80n0:08=False); Set appropriate filtering frequency (0x80n1:19)

Lock value not updated, control bit not reset correctly or continuous mode configuration error confirmed 0x70n0:02/04 has been reset; Check the setting of 0x80n0:22

The frequency/period value is always 0, and the corresponding PDO mode has not been selected. Select the Predefined PDO Assignment with Frequency or Period in the Process Data tab

After firmware update, the module does not work. The firmware does not match the hardware. Please refer to the compatibility table in the document (HW01-05 supports FW01-04); Only use matching combinations

The slight increase does not take effect and the DC mode is not enabled. Select "DC Synchron (input based)" in the DC tab

The timestamps are all 0 and DC mode is not enabled, or the timestamp PDO is not selected and DC mode is enabled; Select Predefined PDO Assignment with Timestamp

Firmware Update and Factory Recovery

Firmware compatibility: EL5102 hardware version 01-05 supports firmware 01-04 (currently the latest 042025/02 release). Before updating, be sure to check the hardware version (CoE 0x1009).

Factory reset: Double click 0x1011:01 in CoE Online, enter the hexadecimal value 0x64616F6C (ASCII "load"), and reset all backup objects to the delivery state. If the terminal was produced before 2007, you can try replacing the value 0x6C6F6164.

Maintenance and scrapping

Cleaning: Use only a soft cloth dipped in glass cleaner or alcohol to wipe the outer shell, and do not use compressed air or abrasives.

Scrap: Dispose of according to electronic waste regulations, and recycle circuit boards separately.