Glossary
Address
The address of a node is used for locating it in the network. It has to be unique in the entire
network.
Aggregate current
Aggregate current of all PA or FF field devices.
Automation system
An automation system is a programmable control system, consisting of at least one CPU,
various input and output modules as well as operating and monitoring devices.
Bus
A common transfer route to which all nodes are connected; it has two defined ends.
Bus connector
Physical connection between the bus node and bus cable.
Control in the Field (CiF)
The FOUNDATION fieldbus function "Control in the Field" (CiF) provides the option to control
I/O blocks between FF devices on an FF segment without CPU intervention, i.e. without
transfer to the process image. Control loops are also possible.
The Link Active Scheduler (LAS) controls data transmission on the FF segment.
Diagnostic interrupt
Diagnostics-capable components report system errors they have detected to the central CPU
by means of diagnostic interrupts.
In SIMATIC S7: When an error is detected or disappears (e.g. wire break), provided the
interrupt is enabled, the module initiates a diagnostic interrupt. The CPU interrupts the
processing of the user program and lower priority priority classes and processes the diagnostic
interrupt block (OB 82).
In SIMATIC S5: The diagnostic interrupt is shown within the device-related diagnostics You
can identify errors, such as wire break, by cyclically scanning the diagnostic bits.
Compact FF Link
Operating Instructions, 03/2015, A5E35651552-AA
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