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Entry type: FAQ Entry ID: 25339501, Entry date: 10/30/2015
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MICROMASTER4 (MM4), SINAMICS G120 (CU2x0x): Detecting and processing F0070, communication fault, by an inverter

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In many applications, when fieldbus (PROFIBUS, PROFINET) communication fails with fault F0070, it is desired to have a bit that signals that fieldbus has failed, and that can then also be freely interconnected. This means that the user can specifically evaluate this fault and himself decide which response is to be made.

When fieldbus communication fails, how can fault F0070 be detected by the inverter and further processed?


The bit can be generated using free blocks (FFB). This is the reason that the recommended method can only be implemented at the MM430 / MM440 and G120 / G120D with CU240S/D DP/DP-F / CU240S/D PN/PN-F.

Parameterization:
P2800 = 1 // Activate FFB
P2801.0 = 1 // Enable AND 1 (level 1)
P2802.12 = 2 // Enable comparator 1 (level 2)
P2802.13 = 2 // Enable comparator 2 (level 2)
P2810.0 = r2886.0 // 1st input of AND 1 = output of comparator 1
P2810.1 = r2888.0 // 2nd input of AND 1 = output of comparator 2
P2885.0 = r0947.0 // 1st input of comparator 1 = last fault code
P2885.1 = P2889 // 2nd input of comparator 1 = fixed setpoint 1
P2887.0 = P2889 // 1st input of comparator 2 = fixed setpoint 1
P2887.1 = r0947.0 // 2nd input of comparator 2 = last fault code
P2889 = 0.43 // Fixed setpoint 1 = 0.43% (the value is only valid for F0070)

r2811 = 1 for fault F0070

Bit r2811 can be used for further BiCo interconnections.


Note: The value 0.43% results from the formula:


This method can be used for all faults.
 

Fig. 1 – Detecting fault F0070


Bit r2811 can be used, e.g. for "remote / local" changeover (P0810 / P0811). To do this, in addition, a flip-flop and a logical OR are parameterized.

Note: Fault F0070 must be acknowledged after changing over between the two command data sets.

Parameterization:
P0704.0 = 99 // Enable BiCo parameterization for digital input 3/4 (DI3/4)
P2801.3 = 1 // Enable OR1 (level 1)
P2801.14 = 1 // Enable RS-FF 1 (level 1)
P2816.0 = r0722.3 // 1st input of OR1 = DI3/4
P2816.1 = r2090.10 // 2nd input of OR1 = Bit r2090.10 (control from PLC)
P2840.0 = r2811.0 // Set input of RS-FF 1 = output of the AND 1 (Bit r2811)
P2840.1 = r2817.0 // Reset input of RS-FF 1 = output of the OR1
P0810 = r2841.0 // CDS Bit0 (remote / local) = output of the RS-FF 1
 

Fig. 2 – REMOTE / LOCAL changeover