MXPLC and MXIO on one bus - timeouts

If we have MXPLC and MXIO on one bus, let's set a pause between telegrams in the properties of the Modbus driver for 50 ms instead of the default zero. Due to long telegrams from MXPLC (multiple values are read at once), the MMIO incorrectly detects the end of the telegram and this spoils its communication.