WAGO I/O-SYSTEM 750 Manual page 25

2.1.1.7.2.2 Block Transfer
The module parameters can be individually read and written using mailbox
commands (see Appendix 6.1). It is also possible, as an alternative, to upload
or download the complete configuration in 512-byte blocks. For example, a
created or read out configuration block can be used to set up and configure all
additional slaves.
512-byte blocks are sent. The transfer is opened each time by the group
DLD_START described in Appendix 6.3.2.1 and closed with DLD_END.
With each DLD_CONT command, one element of the block is transferred. Af-
ter transferring one 512-byte block, the module verifies the checksum.
After the copying process has been successfully completed, the module con-
firms the DLD_END command by sending the calculated checksum and the
return 0x00 (OK).
The format of the configuration block transferred by means of the DLD com-
mands is described in 6.4.
Table 7: Block transfer process using DLD commands
Procedure
The exact mode of operation of the commands "DLD_START",
"DLD_CONT" and "DLD_END" can be found in Appendix 6.3.2.
2.1.1.7.2.3 Communication Mode – Real-Time Profile
In the real-time profile, signals can be monitored in real-time. The cycle and
error message time is assured making this profile especially suited for time-
critical applications such as system monitoring. In case of an error, the system
can be stopped immediately. The real-time network is invisible to Bluetooth
networks. Real-time capable masters only exchange data with directly con-
nected slaves.
Within the module, time intervals between different, repeating events are
monitored by Watchdog and other monitoring mechanisms. In case of distur-
bances, warnings/errors are signaled, depending on the type of disturbance, or
the module is automatically restarted.
WAGO-I/O-SYSTEM 750
I/O Modules
DLD commands Explanations
DLD_START Configuration of the block transfer
n x DLD_CONT Transfer of the 512-byte blocks in n* consecutive elements
(* depends on the mailbox size, see Appendix 6.3.2.2)
DLD_END End of the block transfer, testing of the checksum
I/O Modules • 25
Special Modules
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