Honeywell 621-9938 Redundant Serial I/O Module Analog Digital Output

Honeywell 621-9938 Redundant Serial I/O Module Analog Digital Output

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Description:

The three-position keyswitch on the front panel of the 620-06 Processor Module determines the mode of operation. The three operating mode features in the 620-06 are PROGRAM, DISABLE, and RUN/PROGRAM.

The system may be placed in the PROGRAM mode using the front panel keyswitch, the 623-6000 Loader /Terminal or a Communications Interface Module (CIM). When the system is in the PROGRAM mode, the Processor Module receives commands from the Loader/Terminal or CIM and executes only those commands. The user may clear, enter and edit the ladder diagram program in this mode. The user program is not scanned nor is I/O updated.

While the 620-06 is in the PROGRAM mode, the RUN LED is turned OFF and the scan loss timer is cleared. All local I/Oare cleared or frozen according to the DIP-switch settings of the PIOMs. FORCE functions are possible if the FORCE enable switch on the processor is enabled. Timer and counter values may be modified regardless of the setting of the datachange DIP switch on the processor.

For the processor to be changed from the PROGRAM mode to any other mode of operation, the keyswitch must be changed to one of the other modes and all software requests for PROGRAM mode must be cleared. Software requests may be made from the Loader /Terminal or from a OM. If the processor is placed in the PROGRAM mode by a software request and the request is cleared, the processor returns to the mode identified by the keyswitch position.