User Manual
Chapter 5
GFK-1503F
Jan 2020
Configuration
49
However, actually clearing a configuration from the programmer does cause a new
autoconfiguration to be generated. In that case, autoconfiguration is enabled until a
configuration is stored from the programmer again.
One of the parameters that can be controlled by the software configuration is whether the
CPU reads the configuration and program from Flash at powerup, or from RAM. If Flash is
the configured choice, the CPU will read a previously-stored configuration from its Flash
memory at powerup. If RAM is the choice, the CPU will read a configuration and application
program from its RAM memory at powerup.
5.2
Configuring “Racks” and “Slots”
Even though a VersaMax PLC does not have a module rack, both autoconfiguration and
software configuration use the traditional convention of “racks” and “slots” to identify
module locations in the system. Each logical rack consists of the CPU or an Expansion
Receiver module plus up to 8 additional I/O and option modules mounted on the same DIN
rail. Each I/O or option module occupies a “slot”. The module next to the CPU or Expansion
Receiver module is in slot 1. Booster power supplies do not count as occupying slots.
Figure 43
The main rack is rack 0. Additional racks are numbered 1 to 7.
In a system that uses just one expansion rack which is attached to the expansion bus by a
non-isolated Expansion Receiver Module (IC200ERM002), the expansion rack must be
configured as rack 1.