Configuration and operation
4.7 Configuration in STEP 7 Basic
CP 1243-8 IRC
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Operating Instructions, 06/2015, C79000-G8976-C385-01
●
Siemens Automation MIB
The following exceptions / restrictions apply to the CP.
Write access is permitted only for the following MIB objects of the system group:
–
sysContact
–
sysLocation
–
sysName
A set sysName is sent as the host name using DHCP option 12 to the DHCP server to
register with a DNS server.
For all other MIB objects / MIB object groups, only read access is possible for security
reasons.
Traps are not supported by the CP.
Access permissions using community names
TCP uses the following community strings to control the permissions for access to the SNMP
agent:
Table 4- 1
Access rights in the SNMP agent
Type of access
Community string
*)
Read access
public
Read and write access
private
*) Note the use of lowercase letters!
4.7.9
Configuring data points and messages
Data point-related communication with the CPU
No program blocks need to be programmed for the CP to transfer user data between the
station and communications partner. The data areas in the memory of the CPU intended for
communication with the partner are configured data point-related on the CP. Each data point
is linked to a PLC tag or a data block on the CPU.
Requirement: Created PLC tags and/or data blocks (DBs)
PLC tags or DBs must first be created in the CPU program to allow configuration of the data
points.
The PLC tags for data point configuration can be created in the standard tag table or in a
user-defined tag table. All PLC tags intended to be used for data point configuration must
have the attribute "Visible in HMI".
Address areas of the PLC tags are input, output or bit memory areas on the CPU.
