How Many Tasks can the Ethercat Anybus embeded card handle?

How many Tasks can the Ethercat anybus IO card process. The master is a Beckhoff system.
running 2 tasks at greater than 250uS the system has no problems, when running a third task the LED’s indicate Green blinking in preoperational status, and the red double flash at watchdog timeout error status. Every device in the network becomes inoperable, before and after the anybus card. IO setup to 256/256
Beckhoff CX5130 Embedded computer running TwinCAT 3.1.4022.22.

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