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ROC827 Instruction Manual
Issued Mar-06 Input/Output Modules 4-13
The PI is most commonly used to interface to relays or open
collector/open drain type solid-state devices. The Pulse Input can be used
to interface to either self-powered or ROC827-powered devices.
The high speed input supports signals up to 12 kHz while the low speed
input is used on signals less than 125 Hz.
You can configure the PI module as either 12 or 24 Volts dc using jumper
J4 on the I/O module (see Figure 4-11). The PI modules can provide
isolated +12 Volt dc or +24 Volt dc field transmitter power on a per-
module basis. For example, one module can provide +12 Volt dc power,
while another module in the same ROC827 can provide +24 Volt dc
power. Refer to Figures 4-12 and 4-13.
The PI module provides LEDs that light when each input is active.
Caution
The Pulse Input module only operates with non-powered devices, such as
“dry” relay contacts or isolated solid-state switches. Use of the PI module
with powered devices may cause improper operation or damage.
The PI modules draw power for the active circuitry from the backplane.
Input signals are optically isolated.
Note: Do not connect wiring to both the Low and High speed selections
for a given channel. This results in unpredictable operation of the PI
module.
Figure 4-11. Pulse Input J4 Jumper (Set to +12 V)
+T 12 / 24 V dc
Jumper