Phoenix Contact AXC F 1152, Installing, Starting Up, And Operating

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8.9 Client connections to a PLCnext Engineer HMI web
server
A PLCnext Engineer HMI application is executed on a PLCnext Engineer HMI server. There
are two system variables for handling client connections to a PLCnext Engineer HMI web
server:
– HMI_STATUS
– HMI_CONTROL
8.9.1 HMI_STATUS system variable
The HMI_STATUS system variable can be used to retrieve information on the client connec-
tions to a PLCnext Engineer HMI web server.
The HMI_STATUS system variable is a system variable organized as a data structure.
Table 8-7 HMI_STATUS system variable (HMI_STATUS_TYPE data structure) and the system variables it contains
System variable Type Description
HMI_STATUS HMI_STATUS_TYPE Data structure
CLIENT_COUNT UINT Number of currently existing client connections to the HMI
web server
CLIENTS HMI_STATUS_ARRAY Information on existing client connections
[1] ... [256] HMI_STATUS_STRUCT Client connections 1 ... 256
SESSION_ID STRING Session ID of the client connection
STATION_ID STRING Station ID of the client
LAST_REQ LINT Time of the last request from the client to the controller
IP_ADDRESS IP_ADDRESS_ARRAY IP address of the client
[0] ... [3] BYTE IP address in hexadecimal format
(Example: [C0].[A8].[01].[64] ⇒ 192.168.1.100)