HARDWARE (EI-2000-EXP TERMINAL BLOCKS)
TB10 – RELAYS
– Set point relay contacts
The relays, which are mechanical, can switch 3A, 250V A/C or D/C loads. The power supply
is powered externally (dry).
1
2
CH3 contact
Channel 3 low-level or high-level relay contact.
3
4
CH4 contact
Channel 4 low-level or high-level relay contact.
TB11 – ANALOG OUT
– 4-20mA analog outputs
1
+
CH3 positive signal
2
-
CH3 negative signal
Channel 3, active 4-20mA analog output.
3
+
CH4 positive signal
4
-
CH4 negative signal
Channel 4, active 4-20mA analog output.
TB12 – CH3
Scale input 3
TB13 – CH4
Scale input 4
1 +E Positive
excitation
Positive power supply for the scale base, which is 5V +/-
5%.
2 +S
Positive
signal Positive scale signal input
3
-S
Negative signal
Negative scale signal input
4 -E Negative
excitation
Negative power supply voltage (return) for the scale base,
which is 0 volts referenced to signal ground.
5
SH
Shield
Connected to earth ground
TB30 – RELAYS
– Set point relay contacts
The relays, which are mechanical, can switch 0.5A, 125V A/C or D/C loads. The power
supply is powered externally (dry). These contacts are located on the LCD1602-EI revision
1013. Board revision 0947 does not have these contacts.
1
2
K11 contact
3
4
K12 contact
TB31 – 5V
– This five-volt power supply is utilized for supplying power to devices inside the
box. Do not connect this supply to anything outside the enclosure. The device should not
require more than 100mA.
1 + Positive
5V
2 - Signal
common