Communication between SNAP PAC S1 and AB PLC

Is it possible for the AB PLC to write to the OPTO22 scratchpad? I haven’t ever used the scratchpad but it’s been recommended to me for sharing info, but what about when I need to know something from the AB system?

We have a phoenix contact 5 port managed switch (PN: 2891030) and two phoenix contact 16 port unmanaged switches (PN: 2891933). The two control PCs running PAC display are connected to the 5 port managed switch, and the two 16 port switches are also tied to the managed switch. All the EB1/2 brains and the S1 are connected to the unmanaged switches. This AB PLC would also be connected to an unmanaged switch.