High-speed counter module (1755-hsc) – Rockwell Automation 1755-OF8 GuardPLC Controller Systems User Manual
Page 63

Publication 1753-UM001C-EN-P - March 2010
63
Wire the GuardPLC 2000 Controller and I/O Chapter 5
Unused analog inputs must be short-circuited. Place wire jumpers to
ground on any inputs that are not used.
High-speed Counter
Module (1755-HSC)
The 1755-HSC module features inputs for high-speed counting up to 1
MHz. These counters are 24-bit, and are configurable for either 5V or
24V DC. The counters can be used as a counter or as a decoder for
3-bit Gray Code inputs. As a counter, input A is the counter input,
input B is the counter direction input, and input Z is used for a reset.
The counter inputs must be connected by using shielded, twisted-pair
cables for each measurement input. The shields must be connected at
both ends. The input lines should be no more than 500 m (1640 ft) in
length. All reference (L-, C-, or I- depending on the controller)
connections are interconnected on the module in the form of common
reference pole.
Cables are clipped to the shield-contact plate when connecting
counter inputs. See the instructions for connecting shielded cabling to
the shield contact plate on page
To be sure that counters are used in a safety-related manner (SIL3 in
accordance to IEC 61508), the whole system, including connected
sensors and encoders, must satisfy these safety requirements. Refer to
the GuardPLC Controllers Safety Reference Manual, publication
, for more detailed information.
10
11
12
13
14
15
16
17
18
I-
I6+/2-
I-
I7+/3-
I-
I8+/4-
I-
I5+/1-
Wire
Jumper
1755-IF8
IMPORTANT
D
Do not terminate unused high-speed counter inputs.
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