FX3 High Speed Counter

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Hello!

I'm testing the 1-phase 1-count input high speed counter on a FX3U-32M/DSS. It's reading pulses from a FX5U-32M/ES, 0.5s on 0.5s off. The testing code uses:

OUT_C_32(TRUE,CC235,10);

DHCMOV_M ( ANDF( TRUE , M8013 ) ,C235,1,Pulses);

The problem I encounter is that I keep getting around 4 counts per pulse and calculating the las 10 seconds I get between 3.5 and 4.5 counts per second.

The SS terminals of both PLCs are connected to each other and to the - signal of the 24V power supply, I tried with and without a a resistor connected to the X0 input.

Is this counter actually 4 counts per pulse? I can't seem to find a device to configure this and the measurement is quite poor. Am I missing something?