Configuration Required To Use Winloader; Note For Rtu Communications; Storing A Configuration From A Programmer - GE VersaMax PLC User Manual

78 GFK-1503E
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5.3.6 Configuration Required to use Winloader

The Winloader utility, which can be used for firmware updates, requires SNP
configuration. If Port 1 is configured for another mode or forced to Local Station
Manager operation, Winloader will not be able to do a firmware update on port 1.

5.3.7 Note for RTU Communications

When using RTU communications, it may be necessary to increase the RTU timeout
configured on the master device as the PLC slave scan time increases. It is not necessary
to change the configuration of the VersaMax CPU itself, however.

5.3.8 Storing a Configuration from a Programmer

Ordinarily, a VersaMax PLC system is configured by creating a configuration file on the
programmer (computer), then transferring the file from the programmer to the PLC CPU
via the CPU port. The CPU stores the configuration file in its non-volatile RAM memory.
The configuration is stored whether I/O scanning is enabled or not. After the
configuration is stored, I/O scanning is enabled or disabled according to the newly-stored
configuration parameters.
5.3.8.1 Autoconfiguration and Storing a Configuration
Clearing a configuration from the programmer causes a new autoconfiguration to be
generated. Autoconfiguration remains enabled until the configuration is stored from the
programmer again. Storing a configuration disables autoconfiguration.
5.3.8.2 Storing a Configuration with Non-default Memory
Allocation
If you reconfigure reference tables from the default sizes, storing a hardware
configuration to the PLC in the future will clear memory contents. If you want to retain
memory contents, first load reference memory contents from the PLC to the programmer.
Then, re-store reference memory when you store the hardware configuration from the
programmer to the PLC.
5.3.8.3 Default Serial Port Parameters
When a programmer is first connected, the PLC communicates using the default
communications parameters: 19,200 baud, odd parity, one start bit, one stop bit, and eight
data bits. If these parameters are re-configured, the new settings will be used at powerup
instead.
5.3.8.4 Serial Port Configuration Takes Effect After Removing
Programmer
If a hardware configuration is stored to the CPU, the configuration for the serial port to
which the programmer is connected is not actually installed until the programmer is
removed. After removal of the programmer, there is a delay before the new protocol
begins operating. This delay is equal to the configured T3' time.
VersaMax PLC User Manual