Instructions

Hardware resources
akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany Tel.: [phone] · www.akytec.de
15
To control an output, a value of type REAL32 within the range 0…1 has to be assigned to it
in the program.
When the value of 0.5 is applied to the output 4-20 mA, the output current will be 12 mA.
When the value of 0.5 is applied to the output 0-10 V, the output voltage will be 5 V.
See ALP Help for detailed information about analog output configuration.
4.3 RS485 interface
Up to two RS485 interface cards can be installed in the PR200 for communication via
Modbus RTU / ASCII protocol as master or slave.
The interface card is configured as a slave by default. To use the interface as a master, set
the jumpers XP4 and XP5 on the interface card in accordance with the Fig. 4.6:
 set the both jumpers to M position
 configure the interface using the ALP menu item Device > Configuration
Fig. 4.6 Interface card jumper positions: master (a), slave (b)
See ALP Help for detailed information about RS485 interface configuration. The parameters
can also be changed via system menu (sect. 5.2).
4.3.1 Slave mode
Available network functions:
 read digital I/O status
 read analog I/O value
 read / write network variables
 read / write Real-Time Clock data
Corresponding Modbus registers are listed in Tab. 4.1.
Modbus RTU and Modbus ASCII protocols are supported, with automatic protocol detection.
To add an interface, use the context menu of the node Interfaces in the configuration tree
and select Add interface > RS485 (Fig. 4.7). The new interface is a slave by default.
Use the context menu of the new interface to add a master device (Fig 4.8).
Define the name and the Modbus address for the master.