Memory Module Model No :- 620-0024 Brand :- Honeywell Series :- 620 This is a 24K memory module for the IPC 620-25 and the IPC 620-35.The memory module stores the user control program. The green LED on the front of the module is a self-test light, which is illuminated after successful completion of the self-test.Position in 620-25 : Card slot CPosition in 620-35 : Card slot E Additional memory modules may be installed in the option slots to increase memory capacity to 32K.