Siemens SIMATIC PCS 7 Operating Manual page 234

Appendix
A.1 Communication Problems
● Consistent project engineering and configuration in the CPU and CP
● Maximum number of connections
Communication Errors
Communication errors can occur when using standard device descriptions, for example, HART
Universal Standard descriptions.
● The reason for this may be an unsuitable device assignment. If this is the case, assign a
● Another reason may be that the device does not fulfill or fully implement the standard.
Broken Connection
● Reset functions
● Disturbances
234
– The project engineering settings loaded to the CPU or to a CP must match the
configuration. The routing tables for the project/multiproject must have been created
and all components loaded in the network configuration (NetPro).
To load the configuration to the CPU or to a CP, select the HW Config menu command
Target system > Download to module > Target module.
– Devices or communication components can only manage a restricted number of open
connections. It is therefore possible that connections cannot be established. To open
new connections to devices, close S7 applications. For information on the maximum
number of connections permitted, refer to the respective device manuals.
– At least two connections must be supported simultaneously for remote I/Os to enable
communication with the connected HART devices.
suitable device in the network or plant view.
You can find additional information on this in the following sections:
– Section "Delivery contents (Page 22)"
– Section "Replacing devices (Page 106)"
Contact the device manufacturer in this case.
– Was a reset function triggered in the device? A reset can be triggered manually or by
the firmware of the device (for example, in case of hardware errors or incorrect program
execution). The reset can block the device in a defined "safe" operating state or trigger
a restart of the program with initial settings. These initial settings can differ from the
desired settings, for example, different address or transmission rate.
– Do low-or high-frequency interference occur in the system or is the plant subject to the
influence of electromagnetic fields? Has the power supply of the system, of parts of the
system or of devices been disconnected? Have connectors been withdrawn or plugged
in elsewhere?
Note
If any other communication problems occur, contact the device manufacturer.
Help for SIMATIC PDM (V8.2)
Operating Manual, 02/2014, A5E33203676-AA