Image forming apparatus that operates in normal mode and power saving mode, control method therefor, and storage medium

A control method for an image forming apparatus that includes a printer engine and operates in a normal mode and a power saving mode, the image forming apparatus comprising a main system, a sub system communicably connected with the main system, and an engine controller communicably connected with the sub system and configured to control the printer engine, the control method comprising:

• a step of, when the image forming apparatus returns from the power saving mode to the normal mode, the sub system completing start-up of software necessary for communication between the sub system and the engine controller before starting software necessary for communication between the main system and the sub system is completed, and transmitting, to the engine controller, device information of the image forming apparatus acquired from the main system.

A control method for an image forming apparatus that operates in a normal mode and a power saving mode, and includes a printer engine, a main system, a sub system communicably connected with the main system and an engine controller communicably connected with the sub system and configured to control the printer engine, the control method comprising:

• transmitting, when the image forming apparatus returns from the power saving mode to the normal mode, a start-up program of the sub system and device information of the image information apparatus from the main system,
• starting, in the sub system, a start-up processing of software necessary for communication between the sub system and the engine controller before a start-up processing of software necessary for communication between the main system and the sub system is completed, and
• transmitting, to the engine controller from the sub system, the device information of the image forming apparatus.