PROFINET Communication
‑97‑
To ensure normal operation of the PLC, function blocks such as OB82, 83, 86, and 122
need to be added during programming. The content of the function blocks can be
compiled according to actual needs or left blank.
5.8.2 MRP Function of the MD500-PN1 Card
The Media Redundancy Protocol (MRP) function is implemented by the MRP ring
network in PROFINET. Only one MRP ring network is allowed in one PROFINET
network.
The MD500‑PN1 card with the software version of 1.04 or later supports the MRP
function. (Check U0‑67 on the AC drive to see the version.) To use the MRP function,
the corresponding configuration is required.
Configuring the MRP Function in PORTAL
1. Configure the MRP manager.
An MRP manager is required in the MRP ring network. The MD500‑PN1 card cannot
be used as the manager. Generally, a PLC is used as the manager. Select the station
to be used as the manager, and select Manager (auto) from the Media
redundancy role drop‑down list, as shown in the following figure.
2. Configure the MRP client.
Select the slave, and select Client from the Media redundancy role drop‑down
list, as shown in the following figure. Configure the manager before the client;
otherwise, an error will be reported.
3. Download the configuration.
After configuring all devices in the MRP ring network, compile and download the
configuration to the PLC.
Configuring the MRP Function in STEP 7
1. Configure the MRP manager.
An MRP manager is required in the MRP ring network. The MD500‑PN1 card cannot
be used as the manager. Generally, a PLC is used as the manager. Double‑click PN-
IO of the PLC, click the Media Redundancy tab, and select Manager (auto) from
the Role drop‑down list, as shown in the following figure.
2. Configure the MRP client.
Select the slave, double‑click Interface, click the Media Redundancy tab, and
select Client from the Role drop‑down list, as shown in the following figure.
Configure the manager before the client; otherwise, an error will be reported.
3. Download the configuration.
After configuring all devices in the MRP ring network, compile and download the
configuration to the PLC.
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