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As I know - not.
Profibus DP is intended for field communication and I/O clusters and you need separate communication module - e.g. CI854.
It is possible to use DTM
What if I use PM866-CI854-dp/dp-CI854-PM851 configuration for communication then is it possible
In that scenario will I be able to programme the PM851 from ES
Connection PM8xx+CI854 to other PM8xx+CI854 is not possible. CI854 can be only master. It is not the same like with Siemens.
And why do you need that, each PM8xx has integrated Ethernet port(s) with ABB MMS communication (Ethernet based) for free. It is very easy and fast to connect both CPU's by MMS connect and Access Variables
Also, if you have longer distance between CPU's, could use integrated serial interface COM3 and RS232/RS485 with Modbus RTU
Programming of AC800M is always trough Ethernet connection. It is not possible with Profibus
For Fieldbus Communication(Profibus) need to use CI854 Profibus master module.
CI854 can be connected to any of PM8xx.