Siemens TIM 1531 IRC Operating Instructions Manual page 82

Configuration
4.13 Communication with the CPU
● Max. number of read jobs
Maximum number of low-priority read jobs from the CPU memory area within a CPU scan
cycle.
● Frame memory size
Here, you set the size of the frame memory for events (send buffer).
The size of the frame memory is divided equally among all configured communications
partners. You will find the size of the frame memory in the section Performance data and
configuration limits (Page 25).
You will find details of how the send buffer works (storing and sending events) as well as
the options for transferring data in the section Process image, type of transmission, event
classes (Page 113).
Watchdog bit
● TIM monitoring
Via the watchdog bit the CPU can be informed of the status of the telecontrol
communication of the TIM.
PLC tags for partner status / path status
Via the PLC tag that can be configured here, you can monitor the following information about
the reachability of the communications partners:
● Partner status
Reachability of the remote communications partner
● Path status
Status of the connection path or the redundant connection paths to the remote
communications partner
For the communication response of the two connection paths see section Communication
via the SINAUT ST7 protocol (Page 56).
For every configured communications partner to which a single or redundant telecontrol
connection is created, you can create a PLC tag of the type Word.
Assignment of the PLC tags for partner status / path status
In the two bytes of the PLC tag of the data type Word (DB, memory bit, output) the following
information is output:
● Byte 0: Partner status
● Byte 1: Path status
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Operating Instructions, 02/2018, C79000-G8976-C468-02
TIM 1531 IRC