ABB Procontrol P14 Modbus connection

good morning

we have a P14 connection to external system using TP8701 module (P14 system working as a master). during the commissioning a delay in receiving response about 17 seconds appear.

we would like to solve the problem by decreasing the Scan time of the MODBUS from the default value (20 Seconds).

we tried to do that but unfortunately we fail.

have you any suggestions about this issue?

thanks