3.4 Communication Interfaces
The P634 has a PC interface as a standard component. Communication module A
is optional and can be provided with one or two communication channels –
depending on the design version. Communication between the P634 and the
control station’s computer is through the communication module A. Setting and
interrogation is possible through all the P634's interfaces.
If the communication module A with two communication channels is installed,
settings for two communication interfaces will be available. The setting of
communication interface 1 (COMM1) may be assigned to the physical
communication channels 1 or 2 (see Section 3.12.16, (p. 3-98)). If the COMM1
settings have been assigned to communication channel 2, then the settings of
communication interface 2 (COMM2) will automatically be active for
communication channel 1.
COMM2 can only be used to transmit data to and from the P634 if its PC interface
has been de-activated. As soon as the PC interface is used to transmit data,
COMM2 becomes “dead”. It will only be enabled again when the “time-out”
period for the PC interface has elapsed.
If tests are run on the P634, the user is advised to activate the test mode. In this
way the PC or the control system will recognize all incoming test signals
accordingly (see Section 3.12.17, (p. 3-99)).
P634 3 Operation
3-8 P634/EN M/R-42-A // P634‑311‑653
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