Whether your communication was a violation of the injunction depends on the exact wording of the injunction. If it is, as you wrote, that you can only contact in order to discuss timesharing, you could be in violation due to your communication. There is also the question of the time period for which the injunction was ordered. If it had a set time, it could have expired by now. If, however, it is indefinite, you would need to move to dissolve the injunction. There is a burden to show that the petitioner of the injunction, i.e. your wife, has a reason to continue to be in fear of you. If she is unable to show the Court this evidence, you have a good chance of having the Court dissolve the injunction.
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Although there may have been a technical violation, from a practical standpoint, it is highly unlikely that the communication would rise to the level that would get you arrested. I also would be very surprised if the State Attorney's Office would prosecute such an allegation either. While you certainly can petition the court for a dismissal of the injunction, it sounds like you are going to be in for a fight due to your ex-wife's attitude. This situation is exactly why I personally dislike these permanent injunctions. If you want to increase your odds of success, hire an attorney and get a game plan together. Good luck!