When is it necessary to setup multiple "E0 E1 E2" steps and what is the format? (4 replies)

I am using the following setup.
RUMBA controller
Diamond hot end
Marlin 1.1.0-RC-8
Repetier-Host V1.6.2

I have noticed that when I start Repetier-Host the "E" specification is not transferred from the firmware.

Is this normal for am I not doing something correctly?

These are my settings:
/**
* Default Axis Steps Per Unit (steps/mm)
* Override with M92
* X, Y, Z, E0 [, E1[, E2[, E3]]]
*/
#define DEFAULT_AXIS_STEPS_PER_UNIT { 160, 160, 3200, 188.53 }

/**
* Default Max Feed Rate (mm/s)
* Override with M203
* X, Y, Z, E0 [, E1[, E2[, E3]]]
*/
#define DEFAULT_MAX_FEEDRATE { 300, 300, 5, 25 }