WPA-PSK on multiple WLANs (WCS/WLC 4400)

Greetings,
If I have two different WLANs, both configured for WPA-PSK, are the pre-shared keys different per WLAN?
I ask because when I change the PSK on one WLAN, it seems that this may be affecting the other WLAN.
I'm not on-site to test this out, unfortunately.
It almost appears that setting the pre-shared key is a global setting, and not an individual setting per WLAN.
Any assistance would be appreciated!

The setting of the WPA-PSK should be per WLAN. Changing one shouldn't affect the other WLAN that is configured.

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