Redlion Crimson 3.1 - SLC 5/04

[jhelliot]

Newbie here, so apologies in advance.

In short, we are using a Redlion DA30D to read/write values from an Allen Bradley SLC 5/04. Communications are through RS-232 (DF1).

We aren't having any issues reading values from the PLC, but we are not able to write to the PLC.

We've implemented this setup on a few other machines without this issue, but these machines previously had an AB HMI connected to DF1 whereas this machine did not, so I'm assuming that there may be some channel configuration change needed?

 

[Ken Moore]

My guess would be in the Redlion configuration.

 

[Ken Roach]

Welcome to the PLCTalk forum community !

Please provide some additional detail about the problems you are having writing to the SLC-5/04's data table files.

Which data table file addresses are you writing to ?

Is the Red Lion indicating a communications problem ?

SLC-500 controllers do have data table protection features; you can designate a whole data table file to have "Constant" protection (meaning that all the values are constants and cannot be written to by the program or comms channels) or "Static" protection, which prevents the communication channels from writing to that file. You will find those selections in the Data File Properties window for each data file in RSLogix 500.

There is also a "Write Protected" feature that can be enabled for a communications port, in the Channel Configuration selection. That pretty much locks out all modifications to the program or data tables ever via that port, and would not be typical for a port connected to an HMI. You cannot un-check the Write Protect feature via a Write Protected port, so if you select it on Channel 0 you will need a DH+ connection to Channel 1 to ever modify the program.

 

[RET]

Call Redlion’s tech support. They are extremely helpful.