Hi
Im after some help again.
Ive just been diagnosing a communication problem.
The system comprises Windows 98 PC running OEM Software.
Linked to an Allen Bradley RS232 to DH485 interface.
Then down to the factory floor daisy chained to 6 machines (1,2,3 ,5,6,7)(machines 4,8,9 sold).
Each machine comprises a DH-485 Link Coupler coupled to SCL/03 CPU.
This is an established installation ie has been working for years.
Fault, reported as no comms from pc to the machines.
I attend site to find no LEDS flashing on the DH485 interface next to the PC.
On disconnecting the DH-485 at the Link Coupler on all machines, then connecting just m/c 1 , we had flashing DH-485 LED and RS232 LED when requesting to connect to machine 1, consequently we established good coms on m/c1. We discovered re connecting DH-485 Link Coupler of m/c 2 or 5 stopped DH-485 LED flashing, killing the coms.
Further Investigation showed that m/c 2 coms fault was due to the coms port in the PC/OEM Software being set for com port 2, we changed this to com port 1 and m/c 2 will now communicate.
m/c 5 has a history of the SLC5/03 CPU being replaced due to another fault , the program of which we believe was held on the plug in memory module and transferred across to the new cpu, this fault was cleared and m/c 5 worked but without coms.
We suspect it was replacing the CPU that initiated the "no coms" fault.
We suspect this may be because the "Node" has not been set up in the new replacement SLC5/03 CPU.
Question: is the node number held in the memory module thus making fitting a replacement cpu straight forward. Or do we have to connect a laptop to the CPU manually set the NODE?
Hope you can help please
micgent
Im after some help again.
Ive just been diagnosing a communication problem.
The system comprises Windows 98 PC running OEM Software.
Linked to an Allen Bradley RS232 to DH485 interface.
Then down to the factory floor daisy chained to 6 machines (1,2,3 ,5,6,7)(machines 4,8,9 sold).
Each machine comprises a DH-485 Link Coupler coupled to SCL/03 CPU.
This is an established installation ie has been working for years.
Fault, reported as no comms from pc to the machines.
I attend site to find no LEDS flashing on the DH485 interface next to the PC.
On disconnecting the DH-485 at the Link Coupler on all machines, then connecting just m/c 1 , we had flashing DH-485 LED and RS232 LED when requesting to connect to machine 1, consequently we established good coms on m/c1. We discovered re connecting DH-485 Link Coupler of m/c 2 or 5 stopped DH-485 LED flashing, killing the coms.
Further Investigation showed that m/c 2 coms fault was due to the coms port in the PC/OEM Software being set for com port 2, we changed this to com port 1 and m/c 2 will now communicate.
m/c 5 has a history of the SLC5/03 CPU being replaced due to another fault , the program of which we believe was held on the plug in memory module and transferred across to the new cpu, this fault was cleared and m/c 5 worked but without coms.
We suspect it was replacing the CPU that initiated the "no coms" fault.
We suspect this may be because the "Node" has not been set up in the new replacement SLC5/03 CPU.
Question: is the node number held in the memory module thus making fitting a replacement cpu straight forward. Or do we have to connect a laptop to the CPU manually set the NODE?
Hope you can help please
micgent