Micromod Micro-DCI: 53MC5000 MicroLink - Manual (Page 12)

3.2.2 EXAMPLE OF NETWORK COMMUNICATIONS LOAD CALCULATION
Assumptions: Network Data Rate is set at 1 Mbit/s as dictated by configuration settings, network
size, and cable type; 2 SUPERVISOR-PC units on the network; 1 PC unit with the 53WS5000 prod-
uct package installed on the network; and 14 PCS modules on the network.
1. Calculate loads and TPS for the SUPERVISOR-PC units:
SUPV 1LD SUPV 2LD TOTAL
1a. CON B02 ≠ 255, L00 = 1, 75 80 155
1b. F-TRAN Reads/Writes 118 150 268
1c.Totals 193 230 423
1d. Select required SCAN
for load 1 2
2. SUPERVISOR-PC units 1+2 TPS 193 115 308
= loads/Scan File index
(in Table 3-1, 308 is less than 500)
3. One PC unit with the 53WS5000 product package installed = 50 TPS.
4. Calculate PCS TPS. PCS modules 1,7,9 each have 3 peer-to-peer READS; PCS 4 has
5 peer-to-peer READS; PCS 5 has 4 peer-to-peer READS; and PCS modules 2,3,6,8,10-
14 each have 2 peer-to-peer READS.
PCS PSCAN Reciprocals TPS
1 2,3,4 1/2 + 1/3 + 1/4 1.10
7 4,4,4 1/4 + 1/4 + 1/4 0.75
9 1,1,1 1 + 1 + 1 3.00
4 2,2,4,4,5 1/2 + 1/2 + 1/4 + 1/4 + 1/5 1.70
5 2,2,1,1 1/2 + 1/2 + 1 + 1 3.00
2,3,6,8,10-14 1,2 9 X (1 + 1/2) 13.50
TOTAL PCS 1-14 TPS 23.05
5. Calculate the total network communications load (TPS):
TOTAL TPS for SUPERVISOR-PC units + TOTAL TPS for PC units with 53WS5000
product package installed + TOTAL PCS TPS = TOTAL NETWORK TPS
.
308 + 50 + 23.05 = 381 TPS
Verifying with Table 3-1 indicates a network TPS of 381 is valid, as it is less than
the 500 maximum for a data transfer rate of 1 Mbit/s.
Section 3. MicroLink Network Sizing
10