Electro Cam 5000 Series - Manual (Page 52)

Output Grouping and Modes
Advantages of Grouping Outputs
PS-5XX4 controls can be subdivided into as many as eight
different output groups. Each group can have dedicated
enable input. There are two primary reasons to group
outputs:
1. Outputs may be grouped together so they can be
enabled if a specific input condition is met, and disabled
if that input condition is not met.
A typical example of this situation is gluing. Usually a
photo eye or other device senses the presence of
product immediately before gluing should occur. If the
product is not present, the corresponding glue outputs
should not cycle. The controller can accomplish this type
of logic in Modes 2, 3 or 4, if these glue outputs are
grouped together and the corresponding sensor is
connected to the input which controls this group of
outputs.
2. The outputs are grouped together because they must
maintain a constant phase relationship with each other
while being able to vary their group phase relationship
to the other outputs.
A typical example of this situation is a web converting
process where individual items are being made from a
web of material. Often times the phase relationship
between different sections of the machine changes due
to stretch and other variables. The outputs at each
section must stay in phase with that section, not the
position transducer. If the outputs for a given section
are grouped, the phase of the group can be adjusted,
rather than having to individually adjust each of the
outputs in the group. The adjustments can be made
manually from the keyboard or automatically by an
external signal from a sensor or other control device.
A comprehensive understanding of the operating modes
is required to realize the potential advantages of output
grouping (pages A-3 to A-11 give detailed explanations of
each of the five modes). The fact that each group can be
in any of the five modes and operates independent of the
other groups makes grouping a powerful tool in many
applications.
Grouping Outputs and Establishing Modes
The programming of FCN 8 determines how many output
groups are created and how many outputs will be in each
group. FCN 9 programming determines how many inputs
are available and the mode in which each input (and the
corresponding group of outputs) will operate. The “Output
Group Enable 1” terminal on the logic terminal strip (p. 3-
1) is always the input for Group 1. Additional inputs require
input modules, located in the initial positions of the I/O rack.
These module positions are no longer available for outputs
and the number of outputs available is reduced accordingly.
Appendix A-1
Outputs are assigned to the groups in sequential order.
Therefore, Group 1 output(s) will start with the first available
output (after the input modules on rack) and include the
specified number of outputs. Group 2 will begin with the
next output and run sequentially until its specified number
of outputs is reached. This process continues for up to
eight groups. However, the last group will automatically
include all of the outputs that are left. Therefore, the number
of outputs in the last group is affected by the number of
outputs in the other groups and the number of additional
inputs established.
How to Program
Output Grouping and Modes
1. Access FCN 8 and program the PGM display for the
desired number of output groups. (see p. 4-9)
2. While in FCN 8 assign the desired number of outputs
to each group except the last group (it will always contain
all of the remaining outputs - this number will change if
additional inputs are specified).
3. Access FCN 9 and program the PGM display for the
desired number of inputs (see p. 4-9). Only one input
per output group is allowed. (Inputs do not have to be
allocated for groups operating in Mode 0, if these groups
come after the groups that are using other modes.)
4. While in FCN 9 specify the mode of operation for each
of the inputs established.
5. Program the appropriate input windows (CHN 91 -
Group 1, CHN 92 - Group 2, etc.) for groups that are
operating in Modes 1, 2 or 4. These windows must be
individually programmed in each program used.
Note: Detailed information on the operating characteristics
of modes and the function of the input windows is itemized
for each mode on pages A-3 to A-11.
Logic Input Compared to Input Modules
The input for output Group 1 is on the logic terminal strip
of the controller. Additional inputs require the use of input
modules on the I/O rack. The characteristics of each of
these input types is as follows:
Logic Terminal Input - Accepts a sinking signal only.
Does not give any indication of input status by the input
strip or on the keyboard displays. Response time is
approximately 10 msec. Does not consume an output
position on the I/O rack.
Module Input (module located on I/O rack) - AC and DC
input modules available. Typical DC response is 2-3 msec
and DC modules can be wired for sinking or sourcing
signals. An LED (in or next to module) shows input status.
Input modules are easier to interface electrically, and
provide LED indication of their on/off status. It can be
advantageous not to use the logic terminal input by
operating Group 1 in Mode 0 to control outputs not
associated with input signals.
Note: Once programmed in a channel, this function will be present in that channel in all programs.