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1756-ENBT/A Communication module

Acknowledgement of error messages in the central unit Error messages remain stored and will be displayed until they are acknowledged. The following applies:
The summation error message, the error class messages (bit flags) and the relevant LEDs FK1, FK2 and FK3 are reset with power ON, for example. For other possibilities for resetting/acknowledging them, see chapters A4.5 to A4.8.
The error identifiers and the detailed information (word flags) have to be reset by means of the user program or by means of the operating function ”Overwrite”, see volume 7.3, chapter 3. They are also reset when a cold start is performed or by a power-fail, if no back-up battery is effective. The error message will appear again, if the error has not been eliminated.

Additional diagnosis functions

Status word EW 07,15 The following data are continuously updated in the status word EW 07,15: – Bit 0: This bit is valid for the stand-alone PLC, for the master PLC and for the slave PLC. Bit 0 = 1, There is no error of class 2. Bit 0 = 0, There is an error of class 2. – Bit 1: This bit is valid only for the slave PLC. Bit 1 = 1, The slave PLC is adopted into the bus cycle of the master PLC. Bit 1 = 0, The slave PLC is not adopted into the bus cycle of the master PLC.

– Bit 2: This bit is valid for the stand-alone PLC, for the master PLC and for the slave PLC. Bit 2 = 1, Date and time of the real-time clock are valid. Bit 2 = 0, Date and time of the real-time clock are not valid. – Bit 3: This bit is valid for the stand-alone PLC, for the master PLC and for the slave PLC. Bit 3 = 1, Battery is effective. Bit 3 = 0, Battery is not effective. – Bits 4..7 are not used – Bits 8...15: Maximum number of remote modules which have been existing in the CS31 bus cycle of the master PLC since the last power-ON or since the last cold start. Their number may be larger than the number of the remote modules which are currently existing in the CS31 bus cycle.

Meaning of the contents of the error word flags 

Explanation of the following table: – Address = Memory address at which the error was detected. – Group number = Module address of the remote module – Channel number = Number of the faulty channel – Module type Meaning 000 Binary input 001 Analog input 002 Binary output 003 Analog output 004 Binary input/output 005 Analog input/output 255 Bus master or slave central unit in which the error has occurred and is stored.

CS31 bus error (there is no 16D 10H – – – remote module on the bus) Note: If there are only analog modules connected to the CS31 system bus, this error message may occur when the supply voltage is switched on although the analog modules have been correctly adopted into the CS31 bus cycle after a certain time. Reason: The analog modules have a long initialization time. After this time is over, they only now appear at the CS31 bus as remote modules. During the initialization time the master PLC cannot recognize them.