PCC-IV Instruction Manual (Rev. 0.1)
Page 6-28
Section 6
– Blockware Functions
Technical Reference
F81
[AOUT] Analog (4-20 mA) Output
Function
AOUT
is the Blockware interface to the PCC-IV 4-20 mA output hardware.
AOUT
converts a 0-100% Input
into either a 4-20 mA output (0% = 4 mA), or a 20-4 mA output (0% = 20 mA). The
AOUT
milliamp output is
proportional over the entire -25% to 125% Input range (i.e. 0-24 mA), and the D/A converter has 16-bit resolution
(i.e. 0.0004 mA).
The
AOUT
Block Output is equal to the
AOUT
Block Input, unless the Block Output is "Forced" or under "Service
Manual" (S/M) control (see Section 4).
The
AOUT
Block has an auxiliary digital output called
SM
. This indicates the current Service manual status of this
AOUT
block. This auxiliary output is a 1 if the block is in S/M, and it is a 0 if the block is not in S/M.
When Forced, the
AOUT
Block Output is equal to the percentage that the user entered when the Block was forced.
The 4-
20 mA output is based on the Force Value and the “Reverse Output” parameter. Example:
AOUT
is forced
to 25%, and “Reversed Output” is set to “0” or 4-20 mA; then the actual mA output would be 8 mA. If “Reversed
Output” is set to “1” or 20-4 mA; then the actual mA output would be 16 mA when forced to 25%.
During Service Manual (S/M) mode, the Block Input is ignored, and the user sets the hardware mA output directly
from the Front Panel (see Section 4). During S/M, the
AOUT
Block output will be the percentage that is equivalent
to the mA output. If “Reverse Output” is “1”, the percentage will be scaled accordingly. Example: S/M set output to
8 mA, and “Reverse Output” is “0” (4-20); then Block Output will be 25%. If “Reverse Output” was “1” (20-4); then
the Block Output would be 75%
The
AOUT
function interfaces to Analog Outputs on the CPU board, and on option boards. Parameter 1 specifies
the board location, the CPU board = Board 0. Parameter 2 selects a specific Analog Output on the specified board.
---------------------------------------------------------------------------------------------
NAME: AOUT SINGLE USE FUNCTION: N OUTPUT TYPE: A
---------------------------------------------------------------------------------------------
Input Type Description Notes
_____________________________________________________________________________________________
1 A INPUT BLOCK
Aux. Output
_____________________________________________________________________________________________
1 D
SERVICE MANUAL MODE (SM)
Parameter Description Default Max Min Code Notes
_____________________________________________________________________________________________
1 OPTION BOARD (0=CPU BOARD) 0 2 0 3 1
2 SELECT CH 1 OR CH 2 1 2 1 3 1
3 REVERSE OUTPUT? 0=4-20 1=20-4 0 1 0 3
Notes:
1. The quantity of Outputs available is dependent on the type of option board installed. An
error message is displayed when writing the Blockware to the PCC-IV if sufficient Outputs
are not available.
F83
[TOUT] Triac Output
The T
OUT
Block has an auxiliary digital output called
SM
. This indicates the current Service manual status of this
T
OUT
block. This auxiliary output is a 1 if the block is in S/M, and it is a 0 if the block is not in S/M.
Additional auxiliary outputs (
TTRIP
and
TCODE
) are described below.
Function
TOUT
is the Blockware interface to the PCC-IV Triac output option board hardware. Triacs are solid state
switches for use with 24-120 Vac, 0-2 Amp inductive loads.
TOUT
can be used in one of two modes:
Positioner
mode, OR Dual
Triacs
mode (see Parameter 3).
Dual Triacs Mode
allows direct Blockware control of each of the individual Triacs. Triac 1 is turned on when Triac
1 Input equals 1, Triac 2 is turned on when Triac 2 Input equals 1. In Dual Triacs Mode, the Setpoint Input is
ignored. The Block Output is equal to the Scaled Position as described below in Positioner mode.
