West Control Solutions N8100 - Manual (Page 35)

3.3.6 Status Parameters
3.3.7 Controller Commands
O054-3 3-9
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Parameter Identifier Description
Controller
Status
L Read Only (Type 2 message). Status information is
encoded in four digits as the decimal representation of a
binary number; each bit in the binary number has a
particular significance (see Figure 3-1 ).
Arithmetic
Deviation
V Read Only (Type 2 message). The difference between the
process variable value and the Limit Setpoint value.
Scan
Tables
] Read Only (Type 2 message). Response:
L{N}xxaaaaabbbbbcccccdddddeeeeeA*
where:
xx = Number of data digits in {DATA}
element (20 for single control output,
25 for dual control outputs)
aaaaa = Current setpoint value
bbbbb = Current process variable value
ccccc = Current value of Output 1 Power
(0 - 100%)
ddddd = Current value of Output 2 Power
(0 - 100%) - if applicable.
eeeee = Controller Status (see Figure 3-1)
Parameter Identifier Description
Controller
Commands
Z Implemented by Type 3/Type 4 message sequence only.
In the Type 3 message, {DATA} must be one of eight
five-digit numbers:
00010 Activate Manual Control
00020 Activate Automatic Control
00030 Activate Self-Tune
00040 De-activate Self-Tune
00050 Request Pre-Tune*
00060 Abort Pre-Tune
00130 Activate Loop Alarm
00140 De-activate Loop Alarm
The response from the Controller also contains the same
{DATA} content, as does the response to the Type 4
message.