Entry type: Product note Entry ID: 4342429, Entry date: 07/23/1998
FM 355S and FM 455S - Product Information
Concerns products with the Catalog No.'s: 6ES7 355-1VH10-0AE0 FM 355 for PID control 6ES7 355-1VH00-0AE0 FM 355 for PID control 6ES7 455-1VS00-0AE0 FM 455 for PID control The pulse output of the step controller with and without position feedback can be blocked permanently under certain conditions. This causes the actua- tor to remain in its position irrespectively of the system deviation and it cannot be operated properly in manual mode either. Preliminary remedy: - If the minimum pulse duration is configured to be zero, the above error will not occur. - Since the step controller will not output pulses shorter than the sampling time of the controller, switching on a number of controllers and increas- ing the resolution of the analog input to 14 bits will increase the min. pulse duration and prevent the above error from occurring. We shall inform you as soon as the above problem has been eliminated by a new revision level. -------------------------------
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