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Operating manual ZX09/20/21-Series
7.2.3 ZanderLink
Another way of using the RS-485 interface (or alternatively the SSI interface) is the
point-to-point connection of two ZX controllers using "ZanderLink". One of the con-
trollers is master, the other slave. The differences between master and slave are the
initiation of the communication, which originates from the master, and the clock
generation of the synchronous transmission, which is also done by the master and
transmitted to the slave.
The master sends its packet, the slave responds with minimal delay, then again the
master, and so on.
ZanderLink is designed for the exchange of relatively little user data, but this data is
transferred very quickly. For example, the cyclic exchange of 32 bit user data
(master to slave + slave to master) is possible within a cycle time of 3.75 µs.
In contrast to the other types of networking, ZanderLink does not use the network
variables "VAR_EXTERNAL" and "VAR_GLOBAL", but the programming of the data
transmission is done via the function block "ZLINK".
Fig. 25: Bus topology Modbus RTU (e.g. on ZX09A)
ZX09A
T/R
Lk
RU
OC
1 2 3
ZX09A
T/R
Lk
RU
OC
1 2 3
...
RS-485
RS-485
...
...
120 Ohm
120 Ohm
Note:
Detailed information Programming the ZanderLink communication can be
found in the programming manual in chapter 9.3, which can be found as a
PDF file in the software package "EX_PRESS 5" (version 4.20 or higher,
art. no. 589092) on the USB stick included there.
Example for Modbus RTU master:
Zander HMI-series „MVisio“,
https://www.zander-aachen.de/de/
automation/hmi/mvisio-serie.html
