--- title: "CUE System limits" canonical: "https://docs.cuesystem.com/space/CVCHELP/510787585/CUE%20System%20limits" format: markdown --- > Macro (toc) --- # General - Maximum **number of units** ( controllers and panels ) in a project: **254** - Maximum **number of processes** running at once in a unit - signCUE-two, controlCUE-three with firmware 20.10 or later : **150** - all other units or older firmware: **100** - Maximum **number of running functions**, that are invoked by other units, at once in a unit: **50** - Maximum **size of stack** for a process: - Firmware 7.xx and later: 128 000 bytes - Firmware 6.xx and older: 32 000 bytes - The stack of a process is used for local variables in the process and local variables in functions invoked by the process. If the size of these local variables exceeds the maximum size of a stack of a process the process is stopped by the system. - Maximum **size of all not local variables** ( declared outside functions ) in the unit: - signCUE-one, signCUE-two: 500MB - controlCUE-one, controlCUE-two, controlCUE-three, and all touchCUE panels: 200MB - controlCUE-basic R01, controlCUE-basic R02 , controlCUE-versatile, controlCUE-knx, controlCUE-dmx, controlCUE-dali, smartCUE-relay, smartCUE-versatile: 20MB - controlCUE-basic R04: 60MB - The maximum **length of the Text variable**: - controlCUE-one R04, controlCUE-one R05, controlCUE-one R06, controlCUE-one R07, controlCUE-two R04, controlCUE-two R05, controlCUE-two R06, controlCUE-two R07, signCUE-one, signCUE-two, controlCUE-three and appCUE with firmware 12.00 or later:** **2 500 000 characters - touch panels in revision 22 or higher and firmware 20.00 or later: 2 500 000 characters - all other units and units specified above with lower revision or older firmware : 500 000 characters - The maximum **length of ByteString variable**: - controlCUE-one R04, controlCUE-one R05, controlCUE-one R06, controlCUE-one R07, controlCUE-two R04, controlCUE-two R05, controlCUE-two R06, controlCUE-two R07, signCUE-one, signCUE-two, controlCUE-three and appCUE with firmware 12.00 or later:  5 000 000 bytes - touch panels in revision 22 or higher and firmware 20.00 or later: 5 000 000 bytes - all other units and units specified above with lower revision or older firmware: 1 000 000 bytes # ParseJSON - Maximum size of parameter destination variable in command ParseJSON: - controlCUE-one R04, controlCUE-one R05, controlCUE-one R06, controlCUE-one R07, controlCUE-two R04, controlCUE-two R05, controlCUE-two R06, controlCUE-two R07, signCUE-one, signCUE-two, controlCUE-three and appCUE with firmware 12.00 or later:  5 000 000 bytes - touch panels in revision 22 or higher and firmware 20.00 or later: 5 000 000 bytes - all other units and units specified above with lower revision or older firmware: 1 000 000 bytes If the parameter destination variable in the command ParseJSON is larger than the value specified above then the command returns False and GetLastError returns 158. # IP control channels per unit: - TCP Client - max. 40 for controlCUE-three - max. 32 for rest of units - TCP Server - max. 2 - UDP Client - max. 16 - UDP Server - max. 2 - HTTP Client - max. 16 for controlCUE-three - max. 8 for touch panels, signCUE-one, signCUE-two, controlCUE-one, controlCUE-two - max. 4 for rest of units # HttpClient channels - touch panels in revision 22 or higher and firmware 20.00 or later - The maximum length of the sent body in the Http request is 2 000 000 bytes. - The maximum length of the received body response to an Http request is 5 000 000 bytes. - signCUE-two, controlCUE-three with firmware 20.00 or later - The maximum length of the sent body in the Http request is 2 000 000 bytes. - The maximum length of the received body response to an Http request is 5 000 000 bytes. - appCUE 20.00 or later - The maximum length of the sent body in the Http request is 2 000 000 bytes. - The maximum length of the received body response to an Http request is 5 000 000 bytes. - all other units and units specified above with lower revision or older firmware - The maximum length of the sent body in the Http request is 500 000 bytes. - The maximum length of the received body response to an Http request is 1 000 000 bytes. # WebSocket channels - The maximum length of the received WebSocket message by ReceiveMessage is 1 000 000 bytes. # Inter project communication limits  - The maximum number of IPC servers open in parallel in one unit is 10.  If the number is exceeded, the _IPCServer.The open command returns False and sets the error to 407. - IPC server must be able to process the request and send an answer within IPCSendRequestAndReceiveAnswer time out. This timeout can be specified as the value of a parameter called the timeout of the IPCSendRequestAndReceiveAnswer command. If the time out is exceeded command IPCSendRequestAndReceiveAnswer returns False and sets the error to 413. - The number of IPCSendRequestAndReceiveAnswer commands running in parallel - in the appCUE, 12.10.xxx and older is **16**. - in the appCUE 12.11.205 – 12.30.xxx is **32.** - in the appCUE since version 13.00.xxxx is **40**. - in the signCUE-two, controlCUE-three since firmware version 20.00 is **40**. - in all other units or older firmware versions is **16**. # Video - Maximum number of video objects in a unit: Firmware 15.00 or later and signCUE-two/panels in revision R22 or higher: 16 Older firmware: 16 - Maximum number of running videos at once in a unit: Firmware 15.00 or later and signCUE-two/panels in revision R22 or higher: 4 Older firmware: 1 - Maximum delay for network source to become active: Firmware 15.00 or later and signCUE-two/panels in revision R22 or higher: 30 seconds # WebView - Maximum number of WebView objects in a unit: 16 - Maximum number of launched WebViews in a unit: 1 - It does not warn about neither deny access to pages with invalid SSL certificates. - JavaScript Fullscreen API is not supported. - Context menu is not supported.