Technical data

A-B SuperBridge Technical Reference
14
PLC FILE SPECIFICATION
MC Data in SB is available in PLC style files. They are:
• N12, containing read-only bit or integer oriented data from the MCs, such as inputs, outputs,
alarms and communication status. In N12, there are eight words per connected MC.
• N13, containing read-write bit or integer oriented data for the MCs, containing parameter tags
and function requests. In N13, there are seven words in per connected MC.
• F14*, containing read-only floating point data from the MCs, such as tagged parameters,
feedrates and totals. In F14, there are eight floats per connected MC.
• F15*, containing read-write floating point data for the MCs, such as setpoints. In F15, there
are three floats per connected MC.
*Note: Only SLC5/03 and SLC5/04 versions support floating point files and data
transfer.
Note: Italic names indicate recommended symbol names in A-B ladder logic. x is a
representation of the controller index, starting with A for the MC with controller
index 0, continuing with B for controller index 1 etc. Under certain circumstances,
Merrick will supply a RxLogix programming software symbol table file with the
distribution diskette.
Integer Report File, N12
SuperBridge will maintain a PLC type integer file, with 8 integers per connected MC. The purpose
of this file is to make bit or integer data available to the PLC ladder or MMI programmer. The file
is read only. The file name is N12.
The following is a specification of the 8 words belonging to a certain MC.
MC Status Word, N12:0,8,16..(x_STATUS)
The MC Status word indicates the operative status of the controller. Any bit set indicates a
potential problem. The bits are mapped as follows:
Bit 0 (0001)
(x_OFFLINE)
Off-line. The MC is taken off-line by the Off-line bit in the MC Control Word. If
the Off-line bit in the MC Control Word, N13:4,11,18.. (page 17) is cleared (by
the PLC or Control Room Software) this bit is cleared and the MC Status will
change to "Reviving".
Bit 1 (0002)
(x_COLDST)
Coldstart. The MC has been cold-started, and is in the process of being brought
on-line for normal operation.
Bit 2 (0004)
(x_COMERR)
Communications failure. The MC fails to respond to communications. Attempts
are made periodically to revive the MC. During the revival attempt time, this bit
is cleared and the MC status changes to "Reviving".
Bit 3 (0008)
(x_REVIVE)
Reviving. An attempt is made to make the MC go on-line, either by a revival
attempt from a communications failure or a change of state to 0 of the MC
Control Word Off-line bit. When the revival attempt is concluded, this bit is
cleared and the MC state changes to either "Coldstart", "Communications
failure" or "On-line".
Bit 4 (0010)
(x_SETON)
Always on. This bit is set every time a file copy takes place. It coulb be
periodically cleared by the ladder logic and then checked to see that it is set by
SB. This would ensure that communication between SB and the PLC has not