Det-Tronics Mac - w/Supercard - Manual (Page 32)

M
EMORY
M
AP
O
VERVIEW
Datatable configuration defines the PLC/Gateway addresses that the OIS
will read.
The gateway memory accessible to the OIS emulates a data table in reg-
ister memory on a generic Modicon PLC. Each address is 16 bits wide
(two contiguous bytes).
The gateway supports up to 250 devices. Each device is allotted five 16
bit words of memory in the “datatable”.
■ Two words of “A” memory (type code and configuration
word) normally not read, for diagnostics only.
■ One word of “B” memory (device control words).
■ One word of “C” memory (diagnostics and status).
■ One word of “D” memory (current value of the process vari-
able).
■ “E” memory is used to transfer information to or from any
individual communication module.
■ "F” memory contains “last direction” diagnostic informa-
tion.
At least one datatable must be properly configured and enabled before
the “point display” feature will operate.
Datatable Configuration ( Á4)
2.19
95-8434
A
D
ADDRESS 40002 - 40502
CONTAINS DEVICE TYPE CODES AND
DEVICE CONFIGURATION CODES AS
DEFINED IN NON-VOLATILE MEMORY
ADDRESS 44098 - 44347 CONTAINS 1
WORD OF PROCESS VARIABLE DATA
FOR DEVICES 1 - 250
B
ADDRESS 42050 - 42299
CONTAINS A DEVICE CONTROL WORD
FOR DEVICES 1 - 250
46143 - EOF
INTERNAL DIAGNOSTICS, WORKING
FILES, AND FUTURE FEATURES F
4 KBYTES
2 KBYTES
2 KBYTES
ADDRESS 45121 - 46142
TRANSFER BUFFER FOR MOVING
RECORDS TO AND FROM THE HOST
AND LON DEVICES
C 2 KBYTES
ADDRESS 43074 - 43323
CONTAINS A DEVICE STATUS WORD
FOR DEVICES 1 - 250
E 2 KBYTES
A1532
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