Micro 1400 HSC configuration

tncontrolsystems · Nov 12, 2011

Hello,
I am trying to configure a 1400 for two quadrature encoders. I've got one hsc working ok using inputs 2 and 3, but does anyone know how to configure the second one to look at inputs 4 and 5?

Gil47 · Nov 12, 2011

Can you give us the catalog number of your ML1400.

Do you have a common wire onto Com1, as it is the common for inputs 4 and 5, just as Com0, is the common for inputs 0, 1, 2, 3.

Also HSC is I believe accessed via the Function file in your project tree.

DamianInRochester · Nov 12, 2011

Same exact way, just use function file .1

tncontrolsystems · Nov 12, 2011

DamianInRochester said:
Same exact way, just use function file .1

Do you mean hsc:1? when I configure this it actually stops hsc:0 from working.
I was thinking that maybe I need to tell it which inputs to use.

DamianInRochester · Nov 13, 2011

tncontrolsystems said:
Do you mean hsc:1? when I configure this it actually stops hsc:0 from working.
I was thinking that maybe I need to tell it which inputs to use.

yes, hsc:1 is function file .1 for the HSC.

The answers you seek are in the manual.

http://samplecode.rockwellautomation.com/idc/groups/literature/documents/rm/1766-rm001_-en-p.pdf

The I/O assigment is fixed, you do not have to allocate them.

All MicroLogix 1400, except the 1766-L32AWA and 1766_L32AWAA, have six
100kHz high-speed counters. There are three main high-speed counters (counter 0,
1, 2) and three sub high speed counters (counter 3, 4, 5). Each main high-speed
counter has four dedicated inputs and each sub high-speed counter has two
dedicated inputs. HSC0 utilizes inputs 0…3, HSC1 utilizes inputs 4…7, HSC2
utilizes inputs 8…11, HSC3 utilizes inputs 2 and 3, HSC4 utilizes inputs 6 and 7
and HSC5 utilizes inputs 10 and 11. In some cases, a sub counter will be disabled

by master counter mode. See the section HSC Mode (MOD) on page 94.

tncontrolsystems · Nov 13, 2011

Thanks very much for the reply.
I assumed that inputs 0 and 1 were for hsc 0, 2 and 3 for hsc 1 etc.
All is working beautifully.

Micro 1400 HSC configuration

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