EMBEDDED
PLC BL2500 User’s Manual
FAQ and Troubleshooting
OEM Technology Solutions
Page 57
7.3 TROUBLESHOOTING
7.3.1 Common Errors
Listed below are some solutions of common errors that you may encounter with
EMBEDDED
PLC products.
7.3.1.1 Communications
If you experienced problems with the communication between the Target and either the ISaGRAF
Workbench or a Modbus master check the items below:
•
Disconnect all the physical I/Os connected to the Target and try again.
•
Check that the Modbus Slave Number value in the Target is the same as the Target Slave Number in
the ISaGRAF Workbench.
•
If you are using Ethernet link, check that IP address, Netmask and Default Gateway values are
correct in the Target. Check also that the port in the ISaGRAF Workbench is set to 1100.
•
If you are using RS232 or RS485 link remember that either the ISaGRAF Workbench or the Modbus
master can be connected to the Target at a certain time. Check that the serial port parameters on the
ISaGRAF Workbench and/or Modbus master are the following: Baud rate (19200 to 600, depending
on the Target configuration), no parity, 8 data bits, 1 stop bits and no flow control. If you are using a
RS232-to-USB converter cable check that the COM port assigned to it is within COM1 to COM4
range. If not follow the instructions described in Q3 of the FAQ section.
•
The minimum value of the polling period from ISaGRAF Workbench or a Modbus master must be
greater than the PLC cycle execution time. In any case the absolute minimum values for the polling
period must be greater than the following:
Modbus over TCP/IP: 50 ms
Modbus over RS232 or RS485: 200 ms
7.3.1.2 ISaGRAF Workbench for
EMBEDDED
PLC
If you experienced problems downloading an application to the Target check the items below:
•
Check that you have communication with the Target (check items above).
•
In order to work with
EMBEDDED
PLC make sure that the “RABBIT: TIC code for Rabbit-based
controllers” is selected in the Compiler options list before making and downloading the application.
7.3.1.3
EMBEDDED
PLC Utility
Check the items below if you have problems downloading the
EMBEDDED
PLC Firmware Kernel:
•
Check that the programming cable is connected through DIAG connection to the Target.
•
Check that no other application is using the selected COM port.
•
Check the location of the cold loader, pilot BIOS
and Flash initialization files. Select
Setup
→
File
Locations…
from the main menu bar. Check
that the Cold loader (
COLDLOAD.bin
), Pilot
BIOS (
pilot.bin
) and Flash table
(
flash.ini
) files locations are correct. It should
point to where the
EMBEDDED
PLC Utility is
installed (default
C:\OEMTech\EMBEDDED
PLC\Utility
). Press
OK
.