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Siemens AG, 2002. All rights reserved
SINUMERIK 840D/840Di/810D Diagnostics Guide (DA) – 11.02 Edition
11.02 1 Alarms
4240 Runtime overflow for IPO cycle or position controller cycle, IP %1
Parameters: %1 = Program location
Definitions: The settings for the interpolation and position control cycle were modified before the last
power-up such that too little computing time is now available for the requisite cyclic task.
The alarm occurs immediately after power-up if too little runtime is available even when
the axes are stationary and the NC program has not started. However, task overflow can
occur only when computation-intensive NC functions are called during program execu-
tion.
Reactions: - NC not ready.
- Mode group not ready, also effective for single axes
- Alarm reaction delay is canceled.
- NC Start disable in this channel.
- NC Stop on alarm.
- The NC switches to follow-up mode.
- Alarm display.
- Interface signals are set.
Remedy: Please inform the authorized personnel/service department. Take greater care when opti-
mizing the clock times NCK MD 10050 SYSCLOCK_CYCLE_TIME, MD 10060
POSCTRL_SYSCLOCK_TIME_RATIO and/or MD 10070
IPO_SYSCLOCK_TIME_RATIO.
The test should be performed with an NC program that represents the worst case. For
safety, a margin of 15 to 25% should be added to the times determined in this way.
Program Continuation: Switch control OFF - ON.
4250 FastPlcCom functionality not available
Definitions: This alarm indicates that the PLC provides the None FastPlcCom functionality during
start-up although this functionality is requested by the NCK.
Reactions: - Alarm display.
Remedy: Retrofit the PLC with the FastPlcCom functionality or deactivate the FastPlcCom function-
ality by means of NCK machine data.
Program Continuation: Clear alarm with the RESET key. Restart part program
4252 PLCIO read error: %1
Parameters: %1 = PLCIO error code
Definitions: This alarm indicates that errors occured when reading the PLCIO with the FastPlcCom
functionality.
Reactions: - Alarm display.
Remedy: Correct the machine data or check the PLC hardware configuration.
Program Continuation: Clear alarm with the RESET key. Restart part program
4254 PLCIO write error: %1
Parameters: %1 = PLCIO error code
Definitions: This alarm indicates that errors occured when writing on the PLCIO with the FastPlcCom
functionality.
Reactions: - Alarm display.
Remedy: Correct the machine data or check the PLC hardware configuration.
Program Continuation: Clear alarm with the RESET key. Restart part program
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