johnreitz3303
Member
Presently I am having an issue with the 1756-RIO module in an L63 R.17 communicating with a 1771-DB Basic Module.
Currently I have the block transfer in the RIO module configured in Auto, BTR Update 1000 ms Length 64, BTW Update 3000ms Length 64. This configuration will work for several hours and then fail. Reset of the 1771-DB will result in the block transfers working again for about 3 hours and then eventually failing.
I understand from the manual for the 1771-DB that it is really import to manage the block transfers to ensure that the BTW and BTR are not enabled at the same time.
So what I am looking to do is put the RIO modules block transfer into manual mode and manage them from the PLC. Only thing is that I am not sure how to properly configure the RIO module for this. Specifically of concern is the length of the block transfers. To configure the length in manual mode, the module manual indicates that you set this with the first 6 bits of the control word for the BTR and BTW. Doing this it seems to allow for a max of 63 words, while the module is supposed to support 64. Aside from this, what do you set the length to in the RIO configuration tool, 64 words? Does it matter?
Does anybody have any information of the proper way to configure manual block transfers in the 1756-RIO? And any experience with communicating with the 1771-DB?
Currently I have the block transfer in the RIO module configured in Auto, BTR Update 1000 ms Length 64, BTW Update 3000ms Length 64. This configuration will work for several hours and then fail. Reset of the 1771-DB will result in the block transfers working again for about 3 hours and then eventually failing.
I understand from the manual for the 1771-DB that it is really import to manage the block transfers to ensure that the BTW and BTR are not enabled at the same time.
So what I am looking to do is put the RIO modules block transfer into manual mode and manage them from the PLC. Only thing is that I am not sure how to properly configure the RIO module for this. Specifically of concern is the length of the block transfers. To configure the length in manual mode, the module manual indicates that you set this with the first 6 bits of the control word for the BTR and BTW. Doing this it seems to allow for a max of 63 words, while the module is supposed to support 64. Aside from this, what do you set the length to in the RIO configuration tool, 64 words? Does it matter?
Does anybody have any information of the proper way to configure manual block transfers in the 1756-RIO? And any experience with communicating with the 1771-DB?