Control Techniques Digitax ST Advanced User's Manual page 114

Parameter
Menu 8
structure
8.27 Relay source
8.28 T22 24V output source
Bit SP
Coding
Default See Table 5-7 on page 112
Range Pr 0.00 to Pr 21.51
Update rate Read on drive reset
8.29 Positive logic select
Bit SP
Coding
1
Default On (1)
Update rate Background read
This parameter changes the logic polarity for digital inputs and digital outputs, but not the enable input, the relay output or the 24V output.
Pr 8.29 = 0 (negative logic)
Inputs
Non-relay Outputs On (1) = <5V, OFF (0) = >15V
Relay outputs OFF (0) = open, On (1) = closed
24V output (T22) OFF (0) = 0V, On (1) = 24V
8.30 Open collector output
Bit SP
Coding
1
Default OFF (0)
Update rate Background read
When this parameter is zero digital outputs are in push-pull mode. When this parameter is one either the high-side drive (negative logic polarity) or the
low-side driver (positive logic polarity) is disabled. This allows outputs to be connected in a wire-ORed configuration.
8.31 T24 digital I/O 1 output select
8.32 T25 digital I/O 2 output select
8.33 T26 digital I/O 3 output select
Bit SP
Coding
1
Pr 8.31 = On (1),
Default
Pr 8.32 and Pr 8.33 = OFF (0)
Update rate Background read
OFF (0) = Terminal is an input
On (1) = Terminal is an output
114
Keypad and
Parameter x.00
display
FI DE Txt VM DP ND
2
FI DE Txt VM DP ND
<5V = 1, >15V = 0
OFF (0) = open, On (1) = closed
FI DE Txt VM DP ND
FI DE Txt VM DP ND
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Parameter Advanced parameter
description format descriptions
RA NC NV PT US RW BU
1 1
RA NC NV PT US RW BU
1 1
Pr 8.29 = 1 (positive logic)
<5V = 0, >15V = 1
OFF (0) = <5V, On (1) = >15V
OFF (0) = 0V, On (1) = 24V
RA NC NV PT US RW BU
1
RA NC NV PT US RW BU
1
Serial comms Electronic
protocol nameplate
PS
1 1
PS
1 1
PS
1
PS
1
Digitax ST Advanced User Guide
Performance
Issue Number: 1