5-24 Parameter setting
IM 12B6B3-E-H
5-3-4. mA Output functions
Code 30 *mA Select required output signal. 0-20 or 4-20mA to suit associated
equipment (Recorders, controllers etc.).
Code 31 OUTP.F Select the parameters to transmit on the two mA output signals mA1 &
mA2.
Note: The available choices are affected by the selection of primary parameter (pH/ORP) in ser-
vice code 01, and the selection of secondary parameter (off/ORP/rH) in service code 02.
With pH selected as parameter 1, the default configuration is with mA1
as linear pH output, and mA2 as temperature.
The choices for mA1 (on terminals 61 & 62) are: linear pH, pH table output
(21pt curve), linear parameter 2 (ORP/rH).
The choices for mA2 (a terminal 64 & 65) are: linear pH, pH table, linear
temperature, pH control (PI), parameter 2 control (PI).
Note: To transmit pH (parameter 1) and ORP/rH (parameter 2) simultaneously, set mA1 for
ORP/rH (parameter 2) and mA2 for pH (parameter 1). Service code 31 set to 2.0.
P.I. Control When PI control is selected for mA2 (choice 3 or 4) a further configuration
step is needed.
*D/R This sets the direction of the control action. Direct is a rising output with
rising signal. Reverse is a falling output with rising signal.
With ORP selected as parameter 1, the default configuration is with
mA1 as linear ORP output and mA2 as temperature. The choices for mA1
(on terminals 61 & 62) are: linear ORP, ORP table output (21pt curve).
The choices for mA2 (a terminal 64 & 65) are: linear ORP, ORP table, linear
temperature, ORP control (PI).
P.I. Control When PI control is selected for mA2 (choice 3) a further configuration
step is needed.
*D/R This sets the direction of the control action. Direct is a rising output with
rising signal. Reverse is a falling output with rising signal.
Code 32 BURN Diagnostic error messages can signal a problem by sending the output sig-
nals upscale or downscale (22mA or 0/3.5mA). This is called upscale or
downscale burnout, from the analogy with thermocouple failure signalling of
a burned-out or open circuit sensor. In the case of the EXA the diagnostics
are extensive and cover the whole range of possible sensor faults.
Code 33 RG.mA2 This function sets the proportional range for the mA output control signal
Code 34 tI.mA2 This function sets the integral time for the mA output control signal
Code 35 TABLE The table function allows the configuration of an output curve by 21 steps
& 36 (intervals of 5%)
Table 5-2.
0-20 mA 4-20 mA 0-20 mA 4-20 mA
0% 0 mA 4.0 mA 50% 10 mA 12.0 mA
5% 1 mA 4.8 mA 55% 11 mA 12.8 mA
10% 2 mA 5.6 mA 60% 12 mA 13.6 mA
15% 3 mA 6.4 mA 65% 13 mA 14.4 mA
20% 4 mA 7.2 mA 70% 14 mA 15.2 mA
25% 5 mA 8.0 mA 75% 15 mA 16.0 mA
30% 6 mA 8.8 mA 80% 16 mA 16.8 mA
35% 7 mA 9.6 mA 85% 17 mA 17.6 mA
40% 8 mA 10.4 mA 90% 18 mA 18.4 mA
45% 9 mA 11.2 mA 95% 19 mA 19.2 mA
100% 20 mA 20.0 mA
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