Software Interface
2-26
Block Read Data: PLC → Module (continued)
T
able 2-8
Download
T
able Memory Map (continued)
Hold Values
Location Description Range
Hydraulic Pressure Setpoint Data
211 Step
1 pressure
0—32000
212
Step 2 pressure
0—32000
213
Step 3 pressure
0—32000
↓↓ ↓
219
Step 9 pressure
0—32000
220
Step 10 pressure
0—32000
WY5+220 221
Channel 1 output
0—32000
222
Channel 2 output
0—32000
223
Channel 5 output
0—32000
224
Channel 6 output
0—32000
225*
Output directional bits
and discrete outputs
(16 bits)
* See
Download T
able, Constant 10, for operation during profiles and Chapter 4 for discrete output data.
Hold
value locations 221–225 contain the values that are output to each
channel during any portion of the cycle when the loop for this output does
not control the profile. These hold values are output to all channels,
including those channels not used in some configurations.
While the module is in the idle mode (not controlling a profile), the hold
values are constantly read in and are passed through to the output.
However
, when a profile cycle is initiated, the values are read in at the
beginning of the cycle along with the rest of the table, and are not updated
again until the profile (or consecutive profiles) is completed or stopped and
the cycle is complete.
The three main functions for these values are
• T
o maintain clamp tonnage during inject and pack and hold on a direct-
acting or toggle-ram machine.
• T
o drive outputs when the same proportional valve that is used for
inject is switched to drive the screw
, die height, etc.
• T
o provide a bias for valves that have a dead-band.
Output directional bits in word 225 apply only during the time the hold
values are active. Directional bits during profile execution are taken from
constant 10 of each profile.
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