of 31 slots. The assignment of the virtual slots for diagnostic communication when using the
Compact FF Link is as follows:
● Slot 0
The Compact FF Link occupies slot 0. This also applies in redundant operation with 2
Compact FF Links (IM 655-5 FF).
● Slot 1
Slot 1 is needed for the transmitting of Compact FF Link-specific messages, such as in the
event of a CiR conflict.
● Slots 2 and 3
Slots 2 and 3 are needed for diagnostic communication of the internal field device
coupler(s):
– For operation without ring redundancy/coupler redundancy:
- Slot 2 = Field device coupler in the Compact FF Link
– For operation with ring redundancy/coupler redundancy:
- Slot 2 = Field device coupler in the left FF Link
- Slot 3 = Field device coupler in the right Compact FF Link
● Slots 4-34
The first FF device is always assigned to virtual slot 4 (even in non-redundant mode). The
other slots are determined by the number of configured FF devices.
Slave diagnostics of the Compact FF Link
Slave diagnostics behaves in accordance with IEC 61784-1 CP 3/1. Depending on the DP
master, this data can be read using
STEP 7, SIMATIC PDM or any other configuration tool.
Compact FF Link supplies the diagnostics for itself and the FF devices, as well as the following
errors:
● Discrepancies with the configuration of the Compact FF Link
● External errors such as short circuit or wire break on the FF connection side of the Compact
FF Link or discrepancy between configured and set redundancy mode (DIP switch)
If the Compact FF Link fails, the CPU sets the quality code for all FF devices to "Bad" in the
process image.
Note
If diagnostics of the Compact FF Link and FF devices are available, you should first evaluate
the diagnostic messages of the Compact FF Link and remedy the fault.
Diagnostics of the FF devices
The Compact FF Link can detect the following errors for each FF device:
● FF device not available (address not found)
● Name ("Physical Device (PD) Tag") does not match address (configuration error).
These errors are reported by the Compact FF Link in its diagnostics. If an FF device fails, the
quality code of the FF device is set to "Bad" in the input data by the Compact FF Link.
Alarm, error, and system messages
11.2 Diagnostics of the Compact FF Link
Compact FF Link
Operating Instructions, 03/2015, A5E35651552-AA
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