Honeywell 620-1633 Control Processor Module 620-16 PROC.8K MEM 1024 I/O

Honeywell 620-1633 Control Processor Module 620-16 PROC.8K MEM 1024 I/O

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The System Status Table consists of memory locations 8 bits wide. It stores processor system diagnostic information. This information is accessed through the Loader /Terminal by using a four-digit decimal address and a PULL instruction in the control program. The 620-06 processor system instruction set includes the PULL instruction. Three categories of information are stored in the System Status Table: System Diagnostics, System Hardware Status, and System Identification.

The HARDWARE STATUS display provides the user with data concerning processor revision and Test Status, program scan time, status of DIP-switchselected options and force count.

The processor sends a power fail signal to the PIOMs located in the I/0 racks when the processor is in the PROGRAM or DISABLE mode or when processor scan loss occurs. The PIOMs, upon receiving the power fail signal, either tum all outpt ~OFF or hold outputs in their last state (depending on the selected DIP-switch setting) until the power fail signal is removed. The Processor Module performs the same function for processor rack I/0 modules.

If the power supply in the processor rack or an I/O rack detects that the AC power supply is less than 83 volts in 115V AC operation or 166 volts in 230V AC operation for longer than 11.5 milliseconds, the power supply sends a power fail signal to the other I/0 racks and to the Processor Module. The outputs in the other racks clear or freeze, depending on the response selected via DIP switches, and the processor halts operation. Note that the power fail level for 24VDC operaton is 19 volts with a power fail delay of 7 milliseconds.