Issue
The Momentary Start / Stop (SS) object in a MNB-1000 controller is not working. The OutStrt and OutStp outputs never pulse on as programmed. The OnPulse and OffPulse times are set to 1 second each.
Environment
MNB-1000 with firmware 1.501 or newer
Cause
The On and Off times for a Momentary Start/Stop object fails with a start time or stop time below 2 seconds. The Plant and Remote I/O Module can't do accurate timing below 2 seconds or so by design.
Resolution
Release 1.501 firmware for the MNB-1000 controller allows the Momentary Start / Stop (SS) object to be used with OnPulse and OffPulse intervals of 2 seconds or greater. This is described in the Release Notes for WPT 5.7 / MNB-1000 1.501 Firmware (F-27526).
On and Off Pulse timing wrong for Momentary Start/Stop.
PRN 4677
Issue:
The Momentary Start/Stop times in the MNB-1000 are not accurate
when set for small second increments (1 to 12 seconds)
Resolution:
This has been partially fixed in the MNB-1000 firmware.
Small increments greater than 2 seconds are now accurate.
See the note on PRN 5011 describing limitations on increments
less than 2 seconds.
On and Off Pulse timing wrong for Momentary Start/Stop.
PRN 5011
Issue:
The On and Off times for a Momentary Start/Stop object fails with
a start time or stop time below 2 seconds. The Plant and Remote IO
Module can't do accurate timing below 2 seconds or so by design.
The object still works, but the timing is inaccurate.
Resolution:
A note has been added to document F-27356 (revision 3) "WorkPlace
Tech Tool 5.7 Engineering Guide Supplement" to warn of the
limitations of this object in the MNB-1000.