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PLC BL2500 User’s Manual
FAQ and Troubleshooting
OEM Technology Solutions
Page 55
7.2 FAQ
Q1. What happens if I try to load the
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PLC Firmware Kernel to a Target already running a
licensed
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PLC Kernel?
The
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PLC Utility does not check for an existing license before performing a loading and a
new license is required after a Kernel is loaded to a Target. This means that after loading a new
Kernel to a Target, a new User Reference Code is generated and you will need to contact OEM
Technology Solutions or your local distributor to obtain a new license key to activate the
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PLC Kernel.
Q2. Which are the Modbus function codes supported by
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PLC?
The
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PLC BL2500 supports the following Modbus function code:
1 read
N
bits
3 read
N
words
5
write 1 bit
6
write 1 word
16 write
N
words
These are the function codes supported by ISaGRAF (see Section C.8.2 of [2]).
Q3. How can I change the assigned serial port number to the RS-232-to-USB converter cable on
Windows XP?
Open
Control Panel
→
System
. Click on
Device Manager
. On the Device Manager window
expand the Ports (COM & LPT) category and select the
USB Serial Port (COMx)
. Select
Action
→
Properties
on the menu bar. On the USB Serial Port (COMx) Properties window click on
Port
Setting
tab and click on
Advanced…
On the Advanced window change the COM port number to
within COM1 to COM4 range. For more information about device settings contact your local system
administrator.
Q4. Can I use the other serial ports on the BL2500 from an ISaGRAF application?
The
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PLC Firmware Kernel Version 1.04 uses one RS232 (serial port E) or one RS485
(serial port D) to communicate with the ISaGRAF Workbench or Modbus master. Contact OEM
Technology Solutions or your local
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PLC distributor for information about custom solutions
for the
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PLC Kernel.
Q5. Can I have 2 analog outputs instead of 1 analog input and 1 analog output?
The
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PLC Firmware Kernel Version 1.04 has the analog I/O configuration fixed. For more
information about custom I/O configuration on the
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PLC BL2500 contact OEM Technology
Solutions of your local
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PLC distributor.
Q6. Can I use RabbitNet with
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PLC BL2500?
In Version 1.04 of the
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PLC BL2500 BSP RabbitNet is not supported. Contact OEM
Technology Solutions or your local
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PLC distributor for information about features to be
implemented in upcoming versions.
Q7. Do I need to keep the programming cable connected to the Target all the time?
No. The programming DIAG cable is used only for entering license key or Target configuration
parameters values. After that it can be disconnected.