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Figure 14-2 provides a detailed view of the Mixed I/O module front panel.
Figure 14-2 ACE3600 Mixed I/O Module – Front Panel
The Digital Input (DIs) on the Mixed I/O modules are voltage ("wet") inputs IEC 61131-2
Type II compliant. The first 12 DIs can function as fast counters. All DIs are optically
isolated.
Each DI can be an event trigger (by interrupt) to a high priority fast process. A high priority
fast process enables very fast activation of an output in response to an input trigger and logical
conditions. This high priority fast process is independent of the I/O scan (refer to the STS
Application Programmer manual).
All four relay outputs are Single Pole Double Throw (SPDT) and are referred to as the "Form
C" relays. The physical position of each relay is monitored by the module logic, by using a
back indication signal which is connected to the relay's second contact set. Any contradiction
between the required position and the back indication signal, is reported to the CPU and is
available to the user application program.
In some applications, it is necessary to inhibit relay output operation when attending the site
for safety reasons. In all DO relay modules; it is possible to inhibit all relays per DO module.
When a module is configured to enable relay inhibiting, the power to the relays is provided
from the power supply via a dedicated power line (12V DO), controlled from the "12V DO"
input (TB located on the power supply module panel). When the input's terminals are shorted,
the relays are operational. When the input's terminals are open, the relays are inhibited (EE
relays in the OFF (0) position and ML relays do not change state.)
The user application program can monitor the relay inhibiting status and act accordingly. Also,
when the module's relays are inhibited, any mismatch between the relay position and the
output logical state is ignored.
ERR
D
I
D
O
A I
1
UF
OF
2
UF
OF
3
UF
OF
4
UF
OF
14-2
Mixed I/O Module
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