
PICS
Appendix C
C-6
Load Data Format
(see Note 16)
Maximum number of Upload State Machines (see Note 17)
Notes for PICS Part 4
Note 1: The PLC–5 controller supports all valid normalized
single–precision floating point values, as described in IEEE 754.
Note 2: All integers in the PLC–5 controller can be accessed as signed
integers within the range of –32768 (–(2**15) to 32767 ((2**15)–1)
decimal.
Note 3: All integers in the PLC–5 can be accessed as unsigned integers
within the range of 0 to 32767 ((2**15)–1) decimal.
Note 4: There are no pre–determined maximum lengths for strings.
Maximum length is only constrained by the negotiated Local Detail
parameter of the Initiate Service (see Note 15).
Note 5: Map the PLC–5 logical ASCII addressing into the Symbolic
Address choice of the Address parameter. For logical ASCII address
format, see PLC–5 Programmable Controller Programming Reference
Manual.
Note 6: The date and time of day are supported and maintained in the
PLC–5 controller. Access is through the MMS standardized variable
M_DAYTIME. The Time Sequence Identifier is not supported.
Note 7: Granularity of the time of day is to 1000 milliseconds (1 second).
Note 8: Each 16–bit (word) access to the PLC–5 controller is
uninterruptible.
Note 9: The defined VMD capability strings indicate the PLC–5 processor
model, series, revision, and user memory size (total). These capabilities
are provided for informational use and are not referenced by any MMS
domain.
Note 10: The Local Detail parameter in a Status service response and in
an Unsolicited Status request is a bit string which contains the processor
status word and major fault word of the PLC–5 controller. The following
is a description of each bit in the bitstring when set (to 1):
Bit
Number:
Description:
0
Bad RAM checksum at powerup.
1
Processor is in Run mode.
Содержание PLC-5 MAP/OSI
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